Tcl Source Code

{
    ChannelState *statePtr;	/* State of the real channel. */

    statePtr = ((Channel *) chan)->state->bottomChanPtr->state;

    if (GotFlag(statePtr, CHANNEL_INCLOSE)) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
                    "illegal recursive call to close through close-handler"
                    " of channel", -1));
	}
	return TCL_ERROR;
    }

    if (DetachChannel(interp, chan) != TCL_OK) {
	return TCL_OK;
    }

	    name = chanPtr->state->channelName;
	}
    }

    hTblPtr = GetChannelTable(interp);
    hPtr = Tcl_FindHashEntry(hTblPtr, name);
    if (hPtr == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "can not find channel named \"%s\"", chanName));

	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanName, NULL);
	return NULL;
    }

    /*
     * Always return bottom-most channel in the stack. This one lives the
     * longest - other channels may go away unnoticed. The other APIs

    while ((statePtr != NULL) && (statePtr->topChanPtr != prevChanPtr)) {
	statePtr = statePtr->nextCSPtr;
    }

    if (statePtr == NULL) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                    "couldn't find state for channel \"%s\"",
		    Tcl_GetChannelName(prevChan)));
	}
	return NULL;
    }

    /*
     * Here we check if the given "mask" matches the "flags" of the already
     * existing channel.
     *
     *	  | - | R | W | RW |
     *	--+---+---+---+----+	<=>  0 != (chan->mask & prevChan->mask)
     *	- |   |   |   |    |
     *	R |   | + |   | +  |	The superceding channel is allowed to restrict
     *	W |   |   | + | +  |	the capabilities of the superceded one!
     *	RW|   | + | + | +  |
     *	--+---+---+---+----+
     */

    if ((mask & (statePtr->flags & (TCL_READABLE | TCL_WRITABLE))) == 0) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "reading and writing both disallowed for channel \"%s\"",
		    Tcl_GetChannelName(prevChan)));
	}
	return NULL;
    }

    /*
     * Flush the buffers. This ensures that any data still in them at this
     * time is not handled by the new transformation. Restrict this to

	statePtr->csPtrR = NULL;
	statePtr->csPtrW = NULL;

	if (Tcl_Flush((Tcl_Channel) prevChanPtr) != TCL_OK) {
	    statePtr->csPtrR = csPtrR;
	    statePtr->csPtrW = csPtrW;
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                        "could not flush channel \"%s\"",
			Tcl_GetChannelName(prevChan)));
	    }
	    return NULL;
	}

	statePtr->csPtrR = csPtrR;
	statePtr->csPtrW = csPtrW;
    }

		 * Move error messages put by the driver into the chan/ip
		 * bypass area into the regular interpreter result. Fall back
		 * to the regular message if nothing was found in the
		 * bypasses.
		 */

		if (!TclChanCaughtErrorBypass(interp, chan) && interp) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                            "could not flush channel \"%s\"",
			    Tcl_GetChannelName((Tcl_Channel) chanPtr)));

		}
		return TCL_ERROR;
	    }

	    statePtr->csPtrR  = csPtrR;
	    statePtr->csPtrW = csPtrW;
	}

{
    if (!GotFlag(statePtr, CHANNEL_DEAD)) {
	return 0;
    }

    Tcl_SetErrno(EINVAL);
    if (interp) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
                "unable to access channel: invalid channel", -1));

    }
    return 1;
}

/*
 *----------------------------------------------------------------------
 *

    if (statePtr->refCount > 0) {
	Tcl_Panic("called Tcl_Close on channel with refCount > 0");
    }

    if (GotFlag(statePtr, CHANNEL_INCLOSE)) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
                    "illegal recursive call to close through close-handler"
                    " of channel", -1));
	}
	return TCL_ERROR;
    }
    SetFlag(statePtr, CHANNEL_INCLOSE);

    /*
     * When the channel has an escape sequence driven encoding such as

    statePtr = chanPtr->state;

    /*
     * Does the channel support half-close anyway? Error if not.
     */

    if (!chanPtr->typePtr->close2Proc) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "half-close of channels not supported by %ss",
		chanPtr->typePtr->typeName));
	return TCL_ERROR;
    }

    /*
     * Is the channel unstacked ? If not we fail.
     */

    if (chanPtr != statePtr->topChanPtr) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"half-close not applicable to stack of transformations", -1));

	return TCL_ERROR;
    }

    /*
     * Check direction against channel mode. It is an error if we try to close
     * a direction not supported by the channel (already closed, or never
     * opened for that direction).
     */

    if (!(statePtr->flags & (TCL_READABLE | TCL_WRITABLE) & flags)) {
	const char *msg;

	if (flags & TCL_CLOSE_READ) {
	    msg = "read";
	} else {
	    msg = "write";
	}
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "Half-close of %s-side not possible, side not opened or"
                " already closed", msg));
	return TCL_ERROR;
    }

    /*
     * A user may try to call half-close from within a channel close
     * handler. That won't do.
     */

    if (statePtr->flags & CHANNEL_INCLOSE) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
                    "illegal recursive call to close through close-handler"
                    " of channel", -1));
	}
	return TCL_ERROR;
    }

    if (flags & TCL_CLOSE_READ) {
	/*
	 * Call the finalization code directly. There are no events to handle,

{
    if (interp != NULL) {
	const char *genericopt =
		"blocking buffering buffersize encoding eofchar translation";
	const char **argv;
	int argc, i;
	Tcl_DString ds;
        Tcl_Obj *errObj;

	Tcl_DStringInit(&ds);
	Tcl_DStringAppend(&ds, genericopt, -1);
	if (optionList && (*optionList)) {
	    TclDStringAppendLiteral(&ds, " ");
	    Tcl_DStringAppend(&ds, optionList, -1);
	}
	if (Tcl_SplitList(interp, Tcl_DStringValue(&ds),
		&argc, &argv) != TCL_OK) {
	    Tcl_Panic("malformed option list in channel driver");
	}
	Tcl_ResetResult(interp);

	errObj = Tcl_ObjPrintf("bad option \"%s\": should be one of ",
                optionName);
	argc--;
	for (i = 0; i < argc; i++) {
	    Tcl_AppendPrintfToObj(errObj, "-%s, ", argv[i]);
	}
	Tcl_AppendPrintfToObj(errObj, "or -%s", argv[i]);
        Tcl_SetObjResult(interp, errObj);
	Tcl_DStringFree(&ds);
	ckfree(argv);
    }
    Tcl_SetErrno(EINVAL);
    return TCL_ERROR;
}


    /*
     * If the channel is in the middle of a background copy, fail.
     */

    if (statePtr->csPtrR || statePtr->csPtrW) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
                    "unable to set channel options: background copy in"
                    " progress", -1));
	}
	return TCL_ERROR;
    }

    /*
     * Disallow options on dead channels -- channels that have been closed but
     * not yet been deallocated. Such channels can be found if the exit

	    ResetFlag(statePtr, CHANNEL_UNBUFFERED);
	    SetFlag(statePtr, CHANNEL_LINEBUFFERED);
	} else if ((newValue[0] == 'n') &&
		(strncmp(newValue, "none", len) == 0)) {
	    ResetFlag(statePtr, CHANNEL_LINEBUFFERED);
	    SetFlag(statePtr, CHANNEL_UNBUFFERED);
	} else if (interp) {
            Tcl_SetObjResult(interp, Tcl_NewStringObj(
                    "bad value for -buffering: must be one of"
                    " full, line, or none", -1));
            return TCL_ERROR;
	}
	return TCL_OK;
    } else if (HaveOpt(7, "-buffersize")) {
	int newBufferSize;

	if (Tcl_GetInt(interp, newValue, &newBufferSize) == TCL_ERROR) {

	} else if (argc == 1 || argc == 2) {
	    int outIndex = (argc - 1);
	    int inValue = (int) argv[0][0];
	    int outValue = (int) argv[outIndex][0];

	    if (inValue & 0x80 || outValue & 0x80) {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
                            "bad value for -eofchar: must be non-NUL ASCII"
                            " character", -1));
		}
		ckfree(argv);
		return TCL_ERROR;
	    }
	    if (GotFlag(statePtr, TCL_READABLE)) {
		statePtr->inEofChar = inValue;
	    }
	    if (GotFlag(statePtr, TCL_WRITABLE)) {
		statePtr->outEofChar = outValue;
	    }
	} else {
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"bad value for -eofchar: should be a list of zero,"
			" one, or two elements", -1));
	    }
	    ckfree(argv);
	    return TCL_ERROR;
	}
	if (argv != NULL) {
	    ckfree(argv);
	}

	    readMode = GotFlag(statePtr, TCL_READABLE) ? argv[0] : NULL;
	    writeMode = GotFlag(statePtr, TCL_WRITABLE) ? argv[0] : NULL;
	} else if (argc == 2) {
	    readMode = GotFlag(statePtr, TCL_READABLE) ? argv[0] : NULL;
	    writeMode = GotFlag(statePtr, TCL_WRITABLE) ? argv[1] : NULL;
	} else {
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"bad value for -translation: must be a one or two"
			" element list", -1));
	    }
	    ckfree(argv);
	    return TCL_ERROR;
	}

	if (readMode) {
	    TclEolTranslation translation;

		translation = TCL_TRANSLATE_CR;
	    } else if (strcmp(readMode, "crlf") == 0) {
		translation = TCL_TRANSLATE_CRLF;
	    } else if (strcmp(readMode, "platform") == 0) {
		translation = TCL_PLATFORM_TRANSLATION;
	    } else {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "bad value for -translation: must be one of "
                            "auto, binary, cr, lf, crlf, or platform", -1));

		}
		ckfree(argv);
		return TCL_ERROR;
	    }

	    /*
	     * Reset the EOL flags since we need to look at any buffered data

		statePtr->outputTranslation = TCL_TRANSLATE_CR;
	    } else if (strcmp(writeMode, "crlf") == 0) {
		statePtr->outputTranslation = TCL_TRANSLATE_CRLF;
	    } else if (strcmp(writeMode, "platform") == 0) {
		statePtr->outputTranslation = TCL_PLATFORM_TRANSLATION;
	    } else {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "bad value for -translation: must be one of "
                            "auto, binary, cr, lf, crlf, or platform", -1));

		}
		ckfree(argv);
		return TCL_ERROR;
	    }
	}
	ckfree(argv);
	return TCL_OK;

    chan = Tcl_GetChannel(interp, chanName, NULL);
    if (chan == NULL) {
	return TCL_ERROR;
    }
    chanPtr = (Channel *) chan;
    statePtr = chanPtr->state;
    if ((statePtr->flags & mask) == 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("channel is not %s",
		(mask == TCL_READABLE) ? "readable" : "writable"));
	return TCL_ERROR;
    }

    /*
     * If we are supposed to return the script, do so.
     */

    int nonBlocking = (cmdPtr) ? CHANNEL_NONBLOCKING : 0;

    inStatePtr = inPtr->state;
    outStatePtr = outPtr->state;

    if (BUSY_STATE(inStatePtr, TCL_READABLE)) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                    "channel \"%s\" is busy", Tcl_GetChannelName(inChan)));
	}
	return TCL_ERROR;
    }
    if (BUSY_STATE(outStatePtr, TCL_WRITABLE)) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                    "channel \"%s\" is busy", Tcl_GetChannelName(outChan)));
	}
	return TCL_ERROR;
    }

    readFlags = inStatePtr->flags;
    writeFlags = outStatePtr->flags;

	     *
	     * Note that we cannot have a message in the interpreter bypass
	     * area, StackSetBlockMode is restricted to the channel bypass.
	     * We still need the interp as the destination of the move.
	     */

	    if (!TclChanCaughtErrorBypass(interp, (Tcl_Channel) chanPtr)) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                        "error setting blocking mode: %s",
			Tcl_PosixError(interp)));
	    }
	} else {
	    /*
	     * TIP #219.
	     * If we have no interpreter to put a bypass message into we have
	     * to clear it, to prevent its propagation and use in other places
	     * unrelated to the actual occurence of the problem.

	    Tcl_CreateThreadExitHandler(FinalizeIOCmdTSD, NULL);
	}
	chanObjPtr = tsdPtr->stdoutObjPtr;
    }
    if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_WRITABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for writing",
		TclGetString(chanObjPtr)));
	return TCL_ERROR;
    }

    result = Tcl_WriteObj(chan, string);
    if (result < 0) {
	goto error;
    }

     * Capture error messages put by the driver into the bypass area and put
     * them into the regular interpreter result. Fall back to the regular
     * message if nothing was found in the bypass.
     */

  error:
    if (!TclChanCaughtErrorBypass(interp, chan)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("error writing \"%s\": %s",
		TclGetString(chanObjPtr), Tcl_PosixError(interp)));
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *

	Tcl_WrongNumArgs(interp, 1, objv, "channelId");
	return TCL_ERROR;
    }
    chanObjPtr = objv[1];
    if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_WRITABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for writing",
		TclGetString(chanObjPtr)));
	return TCL_ERROR;
    }

    if (Tcl_Flush(chan) != TCL_OK) {
	/*
	 * TIP #219.
	 * Capture error messages put by the driver into the bypass area and
	 * put them into the regular interpreter result. Fall back to the
	 * regular message if nothing was found in the bypass.
	 */

	if (!TclChanCaughtErrorBypass(interp, chan)) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error flushing \"%s\": %s",
		    TclGetString(chanObjPtr), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*

	Tcl_WrongNumArgs(interp, 1, objv, "channelId ?varName?");
	return TCL_ERROR;
    }
    chanObjPtr = objv[1];
    if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_READABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for reading",
		TclGetString(chanObjPtr)));
	return TCL_ERROR;
    }

    linePtr = Tcl_NewObj();
    lineLen = Tcl_GetsObj(chan, linePtr);
    if (lineLen < 0) {
	if (!Tcl_Eof(chan) && !Tcl_InputBlocked(chan)) {
	    Tcl_DecrRefCount(linePtr);

	    /*
	     * TIP #219.
	     * Capture error messages put by the driver into the bypass area
	     * and put them into the regular interpreter result. Fall back to
	     * the regular message if nothing was found in the bypass.
	     */

	    if (!TclChanCaughtErrorBypass(interp, chan)) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"error reading \"%s\": %s",
			TclGetString(chanObjPtr), Tcl_PosixError(interp)));

	    }
	    return TCL_ERROR;
	}
	lineLen = -1;
    }
    if (objc == 3) {
	if (Tcl_ObjSetVar2(interp, objv[2], NULL, linePtr,

	goto argerror;
    }

    chanObjPtr = objv[i];
    if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_READABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for reading",
		TclGetString(chanObjPtr)));
	return TCL_ERROR;
    }
    i++;			/* Consumed channel name. */

    /*
     * Compute how many bytes to read.
     */

	     * form of the command that is no longer recommended or
	     * documented. See also [Bug #3151675]. Will be removed in Tcl 9,
	     * maybe even earlier.
	     */

	    if (strcmp(TclGetString(objv[i]), "nonewline") != 0) {
#endif
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"expected non-negative integer but got \"%s\"",
			TclGetString(objv[i])));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "NUMBER", NULL);
		return TCL_ERROR;
#if TCL_MAJOR_VERSION < 9
	    }
	    newline = 1;
#endif
	}
    }

    resultPtr = Tcl_NewObj();
    Tcl_IncrRefCount(resultPtr);
    charactersRead = Tcl_ReadChars(chan, resultPtr, toRead, 0);
    if (charactersRead < 0) {
	/*
	 * TIP #219.
	 * Capture error messages put by the driver into the bypass area and
	 * put them into the regular interpreter result. Fall back to the
	 * regular message if nothing was found in the bypass.
	 */

	if (!TclChanCaughtErrorBypass(interp, chan)) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error reading \"%s\": %s",
		    TclGetString(chanObjPtr), Tcl_PosixError(interp)));

	}
	Tcl_DecrRefCount(resultPtr);
	return TCL_ERROR;
    }

    /*
     * If requested, remove the last newline in the channel if at EOF.

	 * TIP #219.
	 * Capture error messages put by the driver into the bypass area and
	 * put them into the regular interpreter result. Fall back to the
	 * regular message if nothing was found in the bypass.
	 */

	if (!TclChanCaughtErrorBypass(interp, chan)) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error during seek on \"%s\": %s",
		    TclGetString(objv[1]), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*

	/*
	 * Check direction against channel mode. It is an error if we try to
	 * close a direction not supported by the channel (already closed, or
	 * never opened for that direction).
	 */

	if (!(dir & Tcl_GetChannelMode(chan))) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "Half-close of %s-side not possible, side not opened"
		    " or already closed", dirOptions[index]));
	    return TCL_ERROR;
	}

	/*
	 * Special handling is needed if and only if the channel mode supports
	 * more than the direction to close. Because if the close the last
	 * direction suppported we can and will go through the regular

	     * TIP #219.
	     * Capture error messages put by the driver into the bypass area
	     * and put them into the regular interpreter result. Fall back to
	     * the regular message if nothing was found in the bypass.
	     */

	    if (!TclChanCaughtErrorBypass(interp, chan)) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"error reading output from command: %s",
			Tcl_PosixError(interp)));
		Tcl_DecrRefCount(resultPtr);
	    }
	    return TCL_ERROR;
	}
    }

    /*

	Tcl_WrongNumArgs(interp, 1, objv, "channelId");
	return TCL_ERROR;
    }

    if (TclGetChannelFromObj(interp, objv[1], &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_READABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for reading",
		TclGetString(objv[1])));
	return TCL_ERROR;
    }

    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(Tcl_InputBlocked(chan)));
    return TCL_OK;
}


	}
	ckfree(cmdArgv);
    }
    if (chan == NULL) {
	return TCL_ERROR;
    }
    Tcl_RegisterChannel(interp, chan);
    Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_GetChannelName(chan), -1));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TcpAcceptCallbacksDeleteProc --

	if (Tcl_GetIndexFromObj(interp, objv[a], socketOptions, "option",
		TCL_EXACT, &optionIndex) != TCL_OK) {
	    return TCL_ERROR;
	}
	switch ((enum socketOptions) optionIndex) {
	case SKT_ASYNC:
	    if (server == 1) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"cannot set -async option for server sockets", -1));
		return TCL_ERROR;
	    }
	    async = 1;
	    break;
	case SKT_MYADDR:
	    a++;
	    if (a >= objc) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"no argument given for -myaddr option", -1));
		return TCL_ERROR;
	    }
	    myaddr = TclGetString(objv[a]);
	    break;
	case SKT_MYPORT: {
	    const char *myPortName;

	    a++;
	    if (a >= objc) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"no argument given for -myport option", -1));
		return TCL_ERROR;
	    }
	    myPortName = TclGetString(objv[a]);
	    if (TclSockGetPort(interp, myPortName, "tcp", &myport) != TCL_OK) {
		return TCL_ERROR;
	    }
	    break;
	}
	case SKT_SERVER:
	    if (async == 1) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"cannot set -async option for server sockets", -1));
		return TCL_ERROR;
	    }
	    server = 1;
	    a++;
	    if (a >= objc) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"no argument given for -server option", -1));
		return TCL_ERROR;
	    }
	    script = TclGetString(objv[a]);
	    break;
	default:
	    Tcl_Panic("Tcl_SocketObjCmd: bad option index to SocketOptions");
	}
    }
    if (server) {
	host = myaddr;		/* NULL implies INADDR_ANY */
	if (myport != 0) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "option -myport is not valid for servers", -1));

	    return TCL_ERROR;
	}
    } else if (a < objc) {
	host = TclGetString(objv[a]);
	a++;
    } else {
	Interp *iPtr;

	Tcl_CreateCloseHandler(chan, TcpServerCloseProc, acceptCallbackPtr);
    } else {
	chan = Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async);
	if (chan == NULL) {
	    return TCL_ERROR;
	}
    }

    Tcl_RegisterChannel(interp, chan);
    Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_GetChannelName(chan), -1));

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FcopyObjCmd --

     * Parse the channel arguments and verify that they are readable or
     * writable, as appropriate.
     */

    if (TclGetChannelFromObj(interp, objv[1], &inChan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_READABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for reading",
		TclGetString(objv[1])));
	return TCL_ERROR;
    }
    if (TclGetChannelFromObj(interp, objv[2], &outChan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if (!(mode & TCL_WRITABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"channel \"%s\" wasn't opened for writing",
		TclGetString(objv[2])));
	return TCL_ERROR;
    }

    toRead = -1;
    cmdPtr = NULL;
    for (i = 3; i < objc; i += 2) {
	if (Tcl_GetIndexFromObj(interp, objv[i], switches, "switch", 0,

    if (TclGetChannelFromObj(interp, objv[2], &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }

    switch ((enum options) index) {
    case PENDING_INPUT:
	if (!(mode & TCL_READABLE)) {
	    Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
	} else {
	    Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_InputBuffered(chan)));
	}
	break;
    case PENDING_OUTPUT:
	if (!(mode & TCL_WRITABLE)) {
	    Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
	} else {
	    Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_OutputBuffered(chan)));
	}
	break;
    }
    return TCL_OK;

	 * User is supplying an explicit length.
	 */

	if (Tcl_GetWideIntFromObj(interp, objv[2], &length) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (length < 0) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "cannot truncate to negative length of file", -1));
	    return TCL_ERROR;
	}
    } else {
	/*
	 * User wants to truncate to the current file position.
	 */

	length = Tcl_Tell(chan);
	if (length == Tcl_WideAsLong(-1)) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not determine current location in \"%s\": %s",
		    TclGetString(objv[1]), Tcl_PosixError(interp)));

	    return TCL_ERROR;
	}
    }

    if (Tcl_TruncateChannel(chan, length) != TCL_OK) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"error during truncate on \"%s\": %s",
		TclGetString(objv[1]), Tcl_PosixError(interp)));

	return TCL_ERROR;
    }

    return TCL_OK;
}

/*

    Tcl_IncrRefCount(dataPtr->command);

    ResultInit(&dataPtr->result);

    dataPtr->self = Tcl_StackChannel(interp, &transformChannelType, dataPtr,
	    mode, chan);
    if (dataPtr->self == NULL) {
	Tcl_AppendPrintfToObj(Tcl_GetObjResult(interp),
		"\nfailed to stack channel \"%s\"", Tcl_GetChannelName(chan));
	Tcl_DecrRefCount(dataPtr->command);
	ResultClear(&dataPtr->result);
	ckfree(dataPtr);
	return TCL_ERROR;
    }

    /*

static void		ForwardOpToHandlerThread(ReflectedChannel *rcPtr,
			    ForwardedOperation op, const void *param);
static int		ForwardProc(Tcl_Event *evPtr, int mask);
static void		SrcExitProc(ClientData clientData);

#define FreeReceivedError(p) \
	if ((p)->base.mustFree) {                               \
	    ckfree((p)->base.msgStr);                           \
	}
#define PassReceivedErrorInterp(i,p) \
	if ((i) != NULL) {                                      \
	    Tcl_SetChannelErrorInterp((i),                      \
		    Tcl_NewStringObj((p)->base.msgStr, -1));    \
	}                                                       \
	FreeReceivedError(p)
#define PassReceivedError(c,p) \
	Tcl_SetChannelError((c), Tcl_NewStringObj((p)->base.msgStr, -1)); \
	FreeReceivedError(p)
#define ForwardSetStaticError(p,emsg) \
	(p)->base.code = TCL_ERROR;                             \
	(p)->base.mustFree = 0;                                 \
	(p)->base.msgStr = (char *) (emsg)
#define ForwardSetDynamicError(p,emsg) \
	(p)->base.code = TCL_ERROR;                             \
	(p)->base.mustFree = 1;                                 \
	(p)->base.msgStr = (char *) (emsg)

static void		ForwardSetObjError(ForwardParam *p, Tcl_Obj *objPtr);

static ReflectedChannelMap *	GetThreadReflectedChannelMap(void);
static void		DeleteThreadReflectedChannelMap(ClientData clientData);

 *	Posts events to a reflected channel, invokes event handlers. The
 *	latter implies that arbitrary side effects are possible.
 *
 *----------------------------------------------------------------------
 */

typedef struct ReflectEvent {
    Tcl_Event header;
    ReflectedChannel *rcPtr;
    int events;
} ReflectEvent;

static int
ReflectEventRun(
    Tcl_Event *ev,
    int flags)
{
    /* OWNER thread
     *
     * Note: When the channel is closed any pending events of this type are
     * deleted. See ReflectClose() for the Tcl_DeleteEvents() calls
     * accomplishing that.
     */

    ReflectEvent *e = (ReflectEvent *) ev;

    Tcl_NotifyChannel(e->rcPtr->chan, e->events);
    return 1;
}

static int
ReflectEventDelete(
    Tcl_Event *ev,
    ClientData cd)
{
    /* OWNER thread
     *
     * Invoked by DeleteThreadReflectedChannelMap() and ReflectClose(). The
     * latter ensures that no pending events of this type are run on an
     * invalid channel.
     */

    ReflectEvent *e = (ReflectEvent *) ev;

    if ((ev->proc != ReflectEventRun) || ((cd != NULL) && (cd != e->rcPtr))) {


        return 0;
    }
    return 1;
}

int
TclChanPostEventObjCmd(

    chanId = TclGetString(objv[CHAN]);

    rcmPtr = GetReflectedChannelMap(interp);
    hPtr = Tcl_FindHashEntry(&rcmPtr->map, chanId);

    if (hPtr == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "can not find reflected channel named \"%s\"", chanId));

	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanId, NULL);
	return TCL_ERROR;
    }

    /*
     * Note that the search above subsumes several of the older checks, namely:
     *

    }

    /*
     * Check that the channel is actually interested in the provided events.
     */

    if (events & ~rcPtr->interest) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "tried to post events channel \"%s\" is not interested in",
                chanId));
	return TCL_ERROR;
    }

    /*
     * We have the channel and the events to post.
     */

#ifdef TCL_THREADS
    if (rcPtr->owner == rcPtr->thread) {
#endif
        Tcl_NotifyChannel(chan, events);
#ifdef TCL_THREADS
    } else {
        ReflectEvent *ev = ckalloc(sizeof(ReflectEvent));

        ev->header.proc = ReflectEventRun;
        ev->events = events;
        ev->rcPtr = rcPtr;

        /*
         * We are not preserving the structure here. When the channel is
         * closed any pending events are deleted, see ReflectClose(), and
         * ReflectEventDelete(). Trying to preserve and later release when the
         * event is run may generate a situation where the channel structure
         * is deleted but not our structure, crashing in
         * FreeReflectedChannel().
         *
         * Force creation of the RCM, for proper cleanup on thread teardown.
         * The teardown of unprocessed events is currently coupled to the
         * thread reflected channel map
         */

        (void) GetThreadReflectedChannelMap();

        /* XXX Race condition !!
         * XXX The destination thread may not exist anymore already.
         * XXX (Delayed postevent executed after channel got removed).
         * XXX Can we detect this ? (check the validity of the owner threadid ?)
         * XXX Actually, in that case the channel should be dead also !
         */

        Tcl_ThreadQueueEvent(rcPtr->owner, (Tcl_Event *) ev, TCL_QUEUE_TAIL);
        Tcl_ThreadAlert(rcPtr->owner);
    }
#endif

    /*
     * Squash interp results left by the event script.
     */

#ifdef TCL_THREADS
	if (rcPtr->thread != Tcl_GetCurrentThread()) {
	    ForwardParam p;

	    ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p);
	    result = p.base.code;

            /*
             * Now squash the pending reflection events for this channel.
             */

            Tcl_DeleteEvents(ReflectEventDelete, rcPtr);

	    if (result != TCL_OK) {
		FreeReceivedError(&p);
	    }
	}
#endif

        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
	return EOK;
    }

    /*
     * -- No -- ASSERT rcPtr->methods & FLAG(METH_FINAL)
     *
     * A cleaned method mask here implies that the channel creation was
     * aborted, and "finalize" must not be called.
     */

    if (rcPtr->methods == 0) {
        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
	return EOK;
    }

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p);
	result = p.base.code;

        /*
         * Now squash the pending reflection events for this channel.
         */

        Tcl_DeleteEvents(ReflectEventDelete, rcPtr);

        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);

	if (result != TCL_OK) {
	    PassReceivedErrorInterp(interp, &p);
	}
    } else {
#endif
	result = InvokeTclMethod(rcPtr, "finalize", NULL, NULL, &resObj);

	hPtr = Tcl_FindHashEntry(&rcmPtr->map,
		Tcl_GetChannelName(rcPtr->chan));
	if (hPtr) {
	    Tcl_DeleteHashEntry(hPtr);
	}
#endif

        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
#ifdef TCL_THREADS
    }
#endif
    return (result == TCL_OK) ? EOK : EINVAL;
}

/*

	SetChannelErrorStr(rcPtr->chan, msg_read_toomuch);
        goto invalid;
    }

    *errorCodePtr = EOK;

    if (bytec > 0) {
	memcpy(buf, bytev, (size_t) bytec);
    }

 stop:
    Tcl_DecrRefCount(toReadObj);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */
    Tcl_Release(rcPtr);
    return bytec;

#endif

    /* ASSERT: rcPtr->method & FLAG(METH_SEEK) */

    Tcl_Preserve(rcPtr);

    offObj  = Tcl_NewWideIntObj(offset);
    baseObj = Tcl_NewStringObj(
            (seekMode == SEEK_SET) ? "start" :
            (seekMode == SEEK_CUR) ? "current" : "end", -1);
    Tcl_IncrRefCount(offObj);
    Tcl_IncrRefCount(baseObj);

    if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj) != TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, resObj);
        goto invalid;
    }

    if (Tcl_GetWideIntFromObj(rcPtr->interp, resObj, &newLoc) != TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, MarshallError(rcPtr->interp));
        goto invalid;

    case TCL_CHANNEL_THREAD_INSERT:
        rcPtr->owner = Tcl_GetCurrentThread();
        break;
    case TCL_CHANNEL_THREAD_REMOVE:
        rcPtr->owner = NULL;
        break;
    default:
        Tcl_Panic("Unknown thread action code.");
        break;
    }
}

#endif
/*
 *----------------------------------------------------------------------

				 * list. */

    if (Tcl_ListObjGetElements(interp, obj, &listc, &listv) != TCL_OK) {
	return TCL_ERROR;
    }

    if (listc < 1) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "bad %s list: is empty", objName));
	return TCL_ERROR;
    }

    events = 0;
    while (listc > 0) {
	if (Tcl_GetIndexFromObj(interp, listv[listc-1], eventOptions,
		objName, 0, &evIndex) != TCL_OK) {

    /*
     * Run over the event queue of this thread and remove all ReflectEvent's
     * still pending. These are inbound events for reflected channels this
     * thread owns but doesn't handle. The inverse of the channel map
     * actually.
     */

    Tcl_DeleteEvents(ReflectEventDelete, NULL);

    /*
     * Get the map of all channels handled by the current thread. This is a
     * ReflectedChannelMap, but on a per-thread basis, not per-interp. Go
     * through the channels, remove all, mark them as dead.
     */

    ForwardingEvent *evPtr = (ForwardingEvent *) evGPtr;
    ForwardingResult *resultPtr = evPtr->resultPtr;
    ReflectedChannel *rcPtr = evPtr->rcPtr;
    Tcl_Interp *interp = rcPtr->interp;
    ForwardParam *paramPtr = evPtr->param;
    Tcl_Obj *resObj = NULL;	/* Interp result of InvokeTclMethod */
    ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in

                                 * this interp. */
    Tcl_HashEntry *hPtr;	/* Entry in the above map */

    /*
     * Ignore the event if no one is waiting for its result anymore.
     */

    if (!resultPtr) {

	 * We remove the channel from both interpreter and thread maps before
	 * releasing the memory, to prevent future accesses (like by
	 * 'postevent') from finding and dereferencing a dangling pointer.
	 */

	rcmPtr = GetReflectedChannelMap(interp);
	hPtr = Tcl_FindHashEntry(&rcmPtr->map,
                Tcl_GetChannelName(rcPtr->chan));
	Tcl_DeleteHashEntry(hPtr);

	rcmPtr = GetThreadReflectedChannelMap();
	hPtr = Tcl_FindHashEntry(&rcmPtr->map,
                Tcl_GetChannelName(rcPtr->chan));
	Tcl_DeleteHashEntry(hPtr);

	FreeReflectedChannelArgs(rcPtr);
	break;

    case ForwardedInput: {
	Tcl_Obj *toReadObj = Tcl_NewIntObj(paramPtr->input.toRead);

	    bytev = Tcl_GetByteArrayFromObj(resObj, &bytec);

	    if (paramPtr->input.toRead < bytec) {
		ForwardSetStaticError(paramPtr, msg_read_toomuch);
		paramPtr->input.toRead = -1;
	    } else {
		if (bytec > 0) {
		    memcpy(paramPtr->input.buf, bytev, (size_t) bytec);
		}
		paramPtr->input.toRead = bytec;
	    }
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(toReadObj);
	break;
    }

    case ForwardedOutput: {
	Tcl_Obj *bufObj = Tcl_NewByteArrayObj((unsigned char *)
                paramPtr->output.buf, paramPtr->output.toWrite);
        Tcl_IncrRefCount(bufObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "write", bufObj, NULL, &resObj) != TCL_OK) {
	    int code = ErrnoReturn(rcPtr, resObj);

	    if (code < 0) {

        Tcl_DecrRefCount(bufObj);
	break;
    }

    case ForwardedSeek: {
	Tcl_Obj *offObj = Tcl_NewWideIntObj(paramPtr->seek.offset);
	Tcl_Obj *baseObj = Tcl_NewStringObj(
                (paramPtr->seek.seekMode==SEEK_SET) ? "start" :
                (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1);

        Tcl_IncrRefCount(offObj);
        Tcl_IncrRefCount(baseObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj)!=TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);

	Tcl_DecrRefCount(maskObj);
        Tcl_Release(rcPtr);
	break;
    }

    case ForwardedBlock: {
	Tcl_Obj *blockObj = Tcl_NewBooleanObj(!paramPtr->block.nonblocking);


        Tcl_IncrRefCount(blockObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "blocking", blockObj, NULL,
                &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(blockObj);
	break;
    }

    case ForwardedSetOpt: {
	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->setOpt.name, -1);
	Tcl_Obj *valueObj  = Tcl_NewStringObj(paramPtr->setOpt.value, -1);

        Tcl_IncrRefCount(optionObj);
        Tcl_IncrRefCount(valueObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "configure", optionObj, valueObj,
                &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(optionObj);
        Tcl_DecrRefCount(valueObj);
	break;
    }

    case ForwardedGetOpt: {
	/*
	 * Retrieve the value of one option.
	 */

	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->getOpt.name, -1);


        Tcl_IncrRefCount(optionObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "cget", optionObj, NULL, &resObj)!=TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	} else {
	    TclDStringAppendObj(paramPtr->getOpt.value, resObj);
	}
        Tcl_Release(rcPtr);

static void		ForwardOpToOwnerThread(ReflectedTransform *rtPtr,
			    ForwardedOperation op, const void *param);
static int		ForwardProc(Tcl_Event *evPtr, int mask);
static void		SrcExitProc(ClientData clientData);

#define FreeReceivedError(p) \
	do {								\
	    if ((p)->base.mustFree) {					\
		ckfree((p)->base.msgStr);				\
	    }								\
	} while (0)
#define PassReceivedErrorInterp(i,p) \
	do {								\
	    if ((i) != NULL) {						\
		Tcl_SetChannelErrorInterp((i),				\
			Tcl_NewStringObj((p)->base.msgStr, -1));	\
	    }								\
	    FreeReceivedError(p);					\
	} while (0)
#define PassReceivedError(c,p) \
	do {								\
	    Tcl_SetChannelError((c),					\
		    Tcl_NewStringObj((p)->base.msgStr, -1));		\
	    FreeReceivedError(p);					\
	} while (0)
#define ForwardSetStaticError(p,emsg) \
	do {								\
	    (p)->base.code = TCL_ERROR;					\
	    (p)->base.mustFree = 0;					\
	    (p)->base.msgStr = (char *) (emsg);				\
	} while (0)
#define ForwardSetDynamicError(p,emsg) \
	do {								\
	    (p)->base.code = TCL_ERROR;					\
	    (p)->base.mustFree = 1;					\
	    (p)->base.msgStr = (char *) (emsg);				\
	} while (0)

static void		ForwardSetObjError(ForwardParam *p,
			    Tcl_Obj *objPtr);

static ReflectedTransformMap *	GetThreadReflectedTransformMap(void);
static void		DeleteThreadReflectedTransformMap(
			    ClientData clientData);
#endif /* TCL_THREADS */

#define SetChannelErrorStr(c,msgStr) \
	Tcl_SetChannelError((c), Tcl_NewStringObj((msgStr), -1))

static Tcl_Obj *	MarshallError(Tcl_Interp *interp);
static void		UnmarshallErrorResult(Tcl_Interp *interp,

    Tcl_Obj *modeObj;		/* mode in obj form for method call */
    int listc;			/* Result of 'initialize', and of */
    Tcl_Obj **listv;		/* its sublist in the 2nd element */
    int methIndex;		/* Encoded method name */
    int result;			/* Result code for 'initialize' */
    Tcl_Obj *resObj;		/* Result data for 'initialize' */
    int methods;		/* Bitmask for supported methods. */

    ReflectedTransformMap *rtmPtr;
				/* Map of reflected transforms with handlers
				 * in this interp. */
    Tcl_HashEntry *hPtr;	/* Entry in the above map */
    int isNew;			/* Placeholder. */

    /*

	goto error;
    }

    methods = 0;
    while (listc > 0) {
	if (Tcl_GetIndexFromObj(interp, listv[listc-1], methodNames,
		"method", TCL_EXACT, &methIndex) != TCL_OK) {

	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "chan handler \"%s initialize\" returned %s",
		    Tcl_GetString(cmdObj),
		    Tcl_GetString(Tcl_GetObjResult(interp))));
	    Tcl_DecrRefCount(resObj);
	    goto error;
	}

	methods |= FLAG(methIndex);
	listc--;
    }

	Tcl_Panic("TclChanPushObjCmd: duplicate transformation handle");
    }
    Tcl_SetHashValue(hPtr, rtPtr);
#ifdef TCL_THREADS
    rtmPtr = GetThreadReflectedTransformMap();
    hPtr = Tcl_CreateHashEntry(&rtmPtr->map, Tcl_GetString(rtId), &isNew);
    Tcl_SetHashValue(hPtr, rtPtr);
#endif /* TCL_THREADS */

    /*
     * Return the channel as the result of the command.
     */

    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    Tcl_GetChannelName(rtPtr->chan), -1));
    return TCL_OK;

  error:
    /*
     * We are not going through ReflectClose as we never had a channel
     * structure.
     */

    Tcl_EventuallyFree(rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
    return TCL_ERROR;

#undef CHAN
#undef CMD
}

/*

	    ForwardOpToOwnerThread(rtPtr, ForwardedClose, &p);
	    result = p.base.code;

	    if (result != TCL_OK) {
		FreeReceivedError(&p);
	    }
	}
#endif /* TCL_THREADS */

	Tcl_EventuallyFree(rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
	return EOK;
    }

    /*
     * In the reflected channel implementation a cleaned method mask here
     * implies that the channel creation was aborted, and "finalize" must not
     * be called. for transformations however we are not going through here on
     * such an abort, but directly through FreeReflectedTransform. So for us
     * that check is not necessary. We always go through 'finalize'.
     */

    if (HAS(rtPtr->methods, METH_DRAIN) && !rtPtr->readIsDrained) {
	if (!TransformDrain(rtPtr, &errorCode)) {
#ifdef TCL_THREADS
	    if (rtPtr->thread != Tcl_GetCurrentThread()) {
		Tcl_EventuallyFree(rtPtr,
			(Tcl_FreeProc *) FreeReflectedTransform);
		return errorCode;
	    } 
#endif /* TCL_THREADS */
	    errorCodeSet = 1;
	    goto cleanup;
	}
    }

    if (HAS(rtPtr->methods, METH_FLUSH)) {
	if (!TransformFlush(rtPtr, &errorCode, FLUSH_WRITE)) {
#ifdef TCL_THREADS
	    if (rtPtr->thread != Tcl_GetCurrentThread()) {
		Tcl_EventuallyFree(rtPtr,
			(Tcl_FreeProc *) FreeReflectedTransform);
		return errorCode;
	    } 
#endif /* TCL_THREADS */
	    errorCodeSet = 1;
	    goto cleanup;
	}
    }

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rtPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	ForwardOpToOwnerThread(rtPtr, ForwardedClose, &p);
	result = p.base.code;

	Tcl_EventuallyFree(rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);

	if (result != TCL_OK) {
	    PassReceivedErrorInterp(interp, &p);
	    return EINVAL;
	}
	return EOK;
    }
#endif /* TCL_THREADS */

    /*
     * Do the actual invokation of "finalize" now; we're in the right thread.
     */

    result = InvokeTclMethod(rtPtr, "finalize", NULL, NULL, &resObj);
    if ((result != TCL_OK) && (interp != NULL)) {

#ifdef TCL_THREADS
	rtmPtr = GetThreadReflectedTransformMap();
	hPtr = Tcl_FindHashEntry(&rtmPtr->map, Tcl_GetString(rtPtr->handle));
	if (hPtr) {
	    Tcl_DeleteHashEntry(hPtr);
	}
#endif /* TCL_THREADS */
    }

    Tcl_EventuallyFree (rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
    return errorCodeSet ? errorCode : ((result == TCL_OK) ? EOK : EINVAL);
}

/*

	    || HAS(rtPtr->methods, METH_FLUSH))) {
	/*
	 * Neither a tell request, nor clear/flush both not supported. We have
	 * to go through the Tcl level to clear and/or flush the
	 * transformation.
	 */

	if (rtPtr->methods & FLAG(METH_CLEAR)) {
	    TransformClear(rtPtr);
	}

	/*
	 * When flushing the transform for seeking the generated results are
	 * irrelevant. We cannot put them into the channel, this would move
	 * the location, throwing it off with regard to where we are and are

    Tcl_HashSearch hSearch;	 /* Search variable. */
    Tcl_HashEntry *hPtr;	 /* Search variable. */
    ReflectedTransform *rtPtr;
#ifdef TCL_THREADS
    ForwardingResult *resultPtr;
    ForwardingEvent *evPtr;
    ForwardParam *paramPtr;
#endif /* TCL_THREADS */

    /*
     * Delete all entries. The channels may have been closed already, or will
     * be closed later, by the standard IO finalization of an interpreter
     * under destruction. Except for the channels which were moved to a
     * different interpreter and/or thread. They do not exist from the IO
     * systems point of view and will not get closed. Therefore mark all as

	resultPtr->result = TCL_ERROR;

	ForwardSetStaticError(paramPtr, msg_send_dstlost);

	Tcl_ConditionNotify(&resultPtr->done);
    }
    Tcl_MutexUnlock(&rtForwardMutex);

#endif /* TCL_THREADS */
}

#ifdef TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * GetThreadReflectedTransformMap --

	    }
	}

	Tcl_DecrRefCount(bufObj);
	break;
    }

    case ForwardedDrain:
	if (InvokeTclMethod(rtPtr, "drain", NULL, NULL, &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	    paramPtr->transform.size = -1;
	} else {
	    /*
	     * Process a regular return. Contains the transformation result.
	     * Sent it back to the request originator.

		paramPtr->transform.buf = ckalloc(bytec);
		memcpy(paramPtr->transform.buf, bytev, (size_t)bytec);
	    } else {
		paramPtr->transform.buf = NULL;
	    }
	}
	break;


    case ForwardedFlush:
	if (InvokeTclMethod(rtPtr, "flush", NULL, NULL, &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	    paramPtr->transform.size = -1;
	} else {
	    /*
	     * Process a regular return. Contains the transformation result.
	     * Sent it back to the request originator.

		paramPtr->transform.buf = ckalloc(bytec);
		memcpy(paramPtr->transform.buf, bytev, (size_t)bytec);
	    } else {
		paramPtr->transform.buf = NULL;
	    }
	}
	break;


    case ForwardedClear:
	(void) InvokeTclMethod(rtPtr, "clear", NULL, NULL, NULL);
	break;


    case ForwardedLimit:
	if (InvokeTclMethod(rtPtr, "limit?", NULL, NULL, &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	    paramPtr->limit.max = -1;
	} else if (Tcl_GetIntFromObj(interp, resObj,
		&paramPtr->limit.max) != TCL_OK) {

    int len;
    const char *msgStr = Tcl_GetStringFromObj(obj, &len);

    len++;
    ForwardSetDynamicError(paramPtr, ckalloc(len));
    memcpy(paramPtr->base.msgStr, msgStr, (unsigned) len);
}
#endif /* TCL_THREADS */

/*
 *----------------------------------------------------------------------
 *
 * TimerKill --
 *
 *	Timer management. Removes the internal timer if it exists.

	}

	*errorCodePtr = EOK;
	ResultAdd(&rtPtr->result, UCHARP(p.transform.buf), p.transform.size);
	ckfree(p.transform.buf);
	return 1;
    }
#endif /* TCL_THREADS */

    /* ASSERT: rtPtr->method & FLAG(METH_READ) */
    /* ASSERT: rtPtr->mode & TCL_READABLE */

    bufObj = Tcl_NewByteArrayObj((unsigned char *) buf, toRead);
    Tcl_IncrRefCount(bufObj);

	}

	*errorCodePtr = EOK;
	res = Tcl_WriteRaw(rtPtr->parent, (char *) p.transform.buf,
		p.transform.size);
	ckfree(p.transform.buf);
    } else
#endif /* TCL_THREADS */
    {
	/* ASSERT: rtPtr->method & FLAG(METH_WRITE) */
	/* ASSERT: rtPtr->mode & TCL_WRITABLE */

	bufObj = Tcl_NewByteArrayObj((unsigned char *) buf, toWrite);
	Tcl_IncrRefCount(bufObj);
	if (InvokeTclMethod(rtPtr, "write", bufObj, NULL, &resObj) != TCL_OK) {

	    return 0;
	}

	*errorCodePtr = EOK;
	ResultAdd(&rtPtr->result, UCHARP(p.transform.buf), p.transform.size);
	ckfree(p.transform.buf);
    } else
#endif /* TCL_THREADS */
    {
	if (InvokeTclMethod(rtPtr, "drain", NULL, NULL, &resObj)!=TCL_OK) {
	    Tcl_SetChannelError(rtPtr->chan, resObj);
	    Tcl_DecrRefCount(resObj);	/* Remove reference held from invoke */
	    *errorCodePtr = EINVAL;
	    return 0;
	}

	    res = Tcl_WriteRaw(rtPtr->parent, (char *) p.transform.buf,
		    p.transform.size);
	} else {
	    res = 0;
	}
	ckfree(p.transform.buf);
    } else
#endif /* TCL_THREADS */
    {
	if (InvokeTclMethod(rtPtr, "flush", NULL, NULL, &resObj)!=TCL_OK) {
	    Tcl_SetChannelError(rtPtr->chan, resObj);
	    Tcl_DecrRefCount(resObj);	/* Remove reference held from invoke */
	    *errorCodePtr = EINVAL;
	    return 0;
	}

#ifdef TCL_THREADS
    if (rtPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	ForwardOpToOwnerThread(rtPtr, ForwardedClear, &p);
	return;
    }
#endif /* TCL_THREADS */

    /* ASSERT: rtPtr->method & FLAG(METH_READ) */
    /* ASSERT: rtPtr->mode & TCL_READABLE */

    (void) InvokeTclMethod(rtPtr, "clear", NULL, NULL, NULL);

    rtPtr->readIsDrained = 0;

	    return TCL_OK;
	}
    }
    if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {
	return TCL_ERROR;
    }
    if (*portPtr > 0xFFFF) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"couldn't open socket: port number too high", -1));

	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------

    void *sock,			/* Socket file descriptor */
    int size)			/* Minimum buffer size */
{
    int current;
    socklen_t len;

    len = sizeof(int);
    getsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_SNDBUF,
	    (char *) &current, &len);
    if (current < size) {
	len = sizeof(int);
	setsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_SNDBUF,
		(char *) &size, len);
    }
    len = sizeof(int);
    getsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_RCVBUF,
		(char *) &current, &len);
    if (current < size) {
	len = sizeof(int);
	setsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_RCVBUF,
		(char *) &size, len);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *

    struct addrinfo *v4head = NULL, *v4ptr = NULL;
    struct addrinfo *v6head = NULL, *v6ptr = NULL;
    char *native = NULL, portstring[TCL_INTEGER_SPACE];
    const char *family = NULL;
    Tcl_DString ds;
    int result, i;



    if (host != NULL) {
	native = Tcl_UtfToExternalDString(NULL, host, -1, &ds);
    }
    TclFormatInt(portstring, port);
    (void) memset(&hints, 0, sizeof(hints));

    hints.ai_family = AF_UNSPEC;

    /* 
     * Magic variable to enforce a certain address family - to be superseded
     * by a TIP that adds explicit switches to [socket]
     */

    if (interp != NULL) {
        family = Tcl_GetVar(interp, "::tcl::unsupported::socketAF", 0);
        if (family != NULL) {
            if (strcmp(family, "inet") == 0) {
                hints.ai_family = AF_INET;
            } else if (strcmp(family, "inet6") == 0) {
                hints.ai_family = AF_INET6;
            }
        }
    }

    hints.ai_socktype = SOCK_STREAM;

#if 0
    /*
     * We found some problems when using AI_ADDRCONFIG, e.g. on systems that
     * have no networking besides the loopback interface and want to resolve
     * localhost. See [Bugs 3385024, 3382419, 3382431]. As the advantage of
     * using AI_ADDRCONFIG in situations where it works, is probably low,
     * we'll leave it out for now. After all, it is just an optimisation.
     *
     * Missing on: OpenBSD, NetBSD.
     * Causes failure when used on AIX 5.1 and HP-UX
     */

    result = getaddrinfo(native, portstring, &hints, addrlist);

    if (host != NULL) {
	Tcl_DStringFree(&ds);
    }

    if (result != 0) {
	*errorMsgPtr =
#ifdef EAI_SYSTEM	/* Doesn't exist on Windows */
		(result == EAI_SYSTEM) ? Tcl_PosixError(interp) :


#endif /* EAI_SYSTEM */
		gai_strerror(result);
        return 0;
    }

    /*
     * Put IPv4 addresses before IPv6 addresses to maximize backwards
     * compatibility of [fconfigure -sockname] output.
     *

	}
	return mode;

    error:
	*seekFlagPtr = 0;
	*binaryPtr = 0;
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "illegal access mode \"%s\"", modeString));
	}
	return -1;
    }

    /*
     * The access modes are specified using a list of POSIX modes such as
     * O_CREAT.

	    mode |= O_EXCL;

	} else if ((c == 'N') && (strcmp(flag, "NOCTTY") == 0)) {
#ifdef O_NOCTTY
	    mode |= O_NOCTTY;
#else
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"access mode \"%s\" not supported by this system",
			flag));
	    }
	    ckfree(modeArgv);
	    return -1;
#endif

	} else if ((c == 'N') && (strcmp(flag, "NONBLOCK") == 0)) {
#ifdef O_NONBLOCK
	    mode |= O_NONBLOCK;
#else
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"access mode \"%s\" not supported by this system",
			flag));
	    }
	    ckfree(modeArgv);
	    return -1;
#endif

	} else if ((c == 'T') && (strcmp(flag, "TRUNC") == 0)) {
	    mode |= O_TRUNC;
	} else if ((c == 'B') && (strcmp(flag, "BINARY") == 0)) {
	    *binaryPtr = 1;
	} else {

	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"invalid access mode \"%s\": must be RDONLY, WRONLY, "
			"RDWR, APPEND, BINARY, CREAT, EXCL, NOCTTY, NONBLOCK,"
			" or TRUNC", flag));
	    }
	    ckfree(modeArgv);
	    return -1;
	}
    }

    ckfree(modeArgv);

    if (!gotRW) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "access mode must include either RDONLY, WRONLY, or RDWR",
		    -1));
	}
	return -1;
    }
    return mode;
}

/*

    if (Tcl_FSGetNormalizedPath(interp, pathPtr) == NULL) {
	return result;
    }

    if (Tcl_FSStat(pathPtr, &statBuf) == -1) {
	Tcl_SetErrno(errno);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return result;
    }
    chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644);
    if (chan == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return result;
    }

    /*
     * The eofchar is \32 (^Z). This is the usual on Windows, but we effect
     * this cross-platform to allow for scripted documents. [Bug: 2040]
     */

    /*
     * Try to read first character of stream, so we can check for utf-8 BOM to
     * be handled especially.
     */

    if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	goto end;
    }
    string = Tcl_GetString(objPtr);

    /*
     * If first character is not a BOM, append the remaining characters,
     * otherwise replace them. [Bug 3466099]
     */

    if (Tcl_ReadChars(chan, objPtr, -1,
	    memcmp(string, "\xef\xbb\xbf", 3)) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	goto end;
    }

    if (Tcl_Close(interp, chan) != TCL_OK) {
	goto end;
    }

    if (Tcl_FSGetNormalizedPath(interp, pathPtr) == NULL) {
	return TCL_ERROR;
    }

    if (Tcl_FSStat(pathPtr, &statBuf) == -1) {
	Tcl_SetErrno(errno);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }
    chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644);
    if (chan == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    /*
     * The eofchar is \32 (^Z). This is the usual on Windows, but we effect
     * this cross-platform to allow for scripted documents. [Bug: 2040]
     */

    /*
     * Try to read first character of stream, so we can check for utf-8 BOM to
     * be handled especially.
     */

    if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;
    }
    string = Tcl_GetString(objPtr);

    /*
     * If first character is not a BOM, append the remaining characters,
     * otherwise replace them. [Bug 3466099]
     */

    if (Tcl_ReadChars(chan, objPtr, -1,
	    memcmp(string, "\xef\xbb\xbf", 3)) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;
    }

    if (Tcl_Close(interp, chan) != TCL_OK) {
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;

	/*
	 * Apply appropriate flags parsed out above.
	 */

	if (seekFlag && Tcl_Seek(retVal, (Tcl_WideInt) 0, SEEK_END)
		< (Tcl_WideInt) 0) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not seek to end of file while opening \"%s\": %s",
			Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	    }
	    Tcl_Close(NULL, retVal);
	    return NULL;
	}
	if (binary) {
	    Tcl_SetChannelOption(interp, retVal, "-translation", "binary");
	}
	return retVal;
    }

    /*
     * File doesn't belong to any filesystem that can open it.
     */

    Tcl_SetErrno(ENOENT);
    if (interp != NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't open \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
    }
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *

		    fsRecPtr->fsPtr->freeInternalRepProc(retCd);
		}
		Tcl_DecrRefCount(retVal);
		retVal = NULL;
		Disclaim();
		goto cdDidNotChange;
	    } else if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"error getting working directory name: %s",
			Tcl_PosixError(interp)));
	    }
	}
	Disclaim();

	/*
	 * Now the 'cwd' may NOT be normalized, at least on some platforms.
	 * For the sake of efficiency, we want a completely normalized cwd at

	     * New API.
	     */

	    TclFSGetCwdProc2 *proc2 = (TclFSGetCwdProc2 *) fsPtr->getCwdProc;

	    retCd = proc2(tsdPtr->cwdClientData);
	    if (retCd == NULL && interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"error getting working directory name: %s",
			Tcl_PosixError(interp)));
	    }

	    if (retCd == tsdPtr->cwdClientData) {
		goto cdDidNotChange;
	    }

	    /*

     * The filesystem doesn't support 'load', so we fall back on the following
     * technique:
     *
     * First check if it is readable -- and exists!
     */

    if (Tcl_FSAccess(pathPtr, R_OK) != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't load library \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

#ifdef TCL_LOAD_FROM_MEMORY
    /*
     * The platform supports loading code from memory, so ask for a buffer of
     * the appropriate size, read the file into it and load the code from the

	if (ret == TCL_OK && *handlePtr != NULL) {
	    goto resolveSymbols;
	}
    }

  mustCopyToTempAnyway:
    Tcl_ResetResult(interp);
#endif /* TCL_LOAD_FROM_MEMORY */

    /*
     * Get a temporary filename to use, first to copy the file into, and then
     * to load.
     */

    copyToPtr = TclpTempFileNameForLibrary(interp, pathPtr);
    Tcl_IncrRefCount(copyToPtr);

    copyFsPtr = Tcl_FSGetFileSystemForPath(copyToPtr);
    if ((copyFsPtr == NULL) || (copyFsPtr == fsPtr)) {
	/*
	 * We already know we can't use Tcl_FSLoadFile from this filesystem,
	 * and we must avoid a possible infinite loop. Try to delete the file
	 * we probably created, and then exit.
	 */

	Tcl_FSDeleteFile(copyToPtr);
	Tcl_DecrRefCount(copyToPtr);
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"couldn't load from current filesystem", -1));

	return TCL_ERROR;
    }

    if (TclCrossFilesystemCopy(interp, pathPtr, copyToPtr) != TCL_OK) {
	/*
	 * Cross-platform copy failed.
	 */

    finderinfo *finder = (finderinfo *) &finfo.data;
    off_t *rsrcForkSize = (off_t *) &finfo.data;
    const char *native;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    if (S_ISDIR(statBuf.st_mode) && objIndex != MACOSX_HIDDEN_ATTRIBUTE) {
	/*
	 * Directories only support attribute "-hidden".
	 */

	errno = EISDIR;
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"invalid attribute: %s", Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    if (objIndex == MACOSX_RSRCLENGTH_ATTRIBUTE) {
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
    } else {
	alist.commonattr = ATTR_CMN_FNDRINFO;
    }
    native = Tcl_FSGetNativePath(fileName);
    result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read attributes of \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    switch (objIndex) {
    case MACOSX_CREATOR_ATTRIBUTE:
	*attributePtrPtr = NewOSTypeObj(
		OSSwapBigToHostInt32(finder->creator));

	break;
    case MACOSX_RSRCLENGTH_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewWideIntObj(*rsrcForkSize);
	break;
    }
    return TCL_OK;
#else
    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "Mac OS X file attributes not supported", -1));
    Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
    return TCL_ERROR;
#endif /* HAVE_GETATTRLIST */
}

/*
 *---------------------------------------------------------------------------
 *
 * TclMacOSXSetFileAttribute --
 *

    finderinfo *finder = (finderinfo *) &finfo.data;
    off_t *rsrcForkSize = (off_t *) &finfo.data;
    const char *native;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    if (S_ISDIR(statBuf.st_mode) && objIndex != MACOSX_HIDDEN_ATTRIBUTE) {
	/*
	 * Directories only support attribute "-hidden".
	 */

	errno = EISDIR;
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"invalid attribute: %s", Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    if (objIndex == MACOSX_RSRCLENGTH_ATTRIBUTE) {
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
    } else {
	alist.commonattr = ATTR_CMN_FNDRINFO;
    }
    native = Tcl_FSGetNativePath(fileName);
    result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read attributes of \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    if (objIndex != MACOSX_RSRCLENGTH_ATTRIBUTE) {
	OSType t;
	int h;

	    break;
	}

	result = setattrlist(native, &alist,
		&finfo.data, sizeof(finfo.data), 0);

	if (result != 0) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set attributes of \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	    return TCL_ERROR;
	}
    } else {
	Tcl_WideInt newRsrcForkSize;

	if (Tcl_GetWideIntFromObj(interp, attributePtr,
		&newRsrcForkSize) != TCL_OK) {
	    return TCL_ERROR;
	}

	if (newRsrcForkSize != *rsrcForkSize) {
	    Tcl_DString ds;

	    /*
	     * Only setting rsrclength to 0 to strip a file's resource fork is
	     * supported.
	     */

	    if (newRsrcForkSize != 0) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"setting nonzero rsrclength not supported", -1));
		Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
		return TCL_ERROR;
	    }

	    /*
	     * Construct path to resource fork.
	     */

		    result = close(fd);
		}
	    }

	    Tcl_DStringFree(&ds);

	    if (result != 0) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not truncate resource fork of \"%s\": %s",
			TclGetString(fileName), Tcl_PosixError(interp)));

		return TCL_ERROR;
	    }
	}
    }
    return TCL_OK;
#else
    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "Mac OS X file attributes not supported", -1));
    Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
    return TCL_ERROR;
#endif
}

/*
 *---------------------------------------------------------------------------

    Tcl_Encoding encoding = Tcl_GetEncoding(NULL, "macRoman");

    string = Tcl_GetStringFromObj(objPtr, &length);
    Tcl_UtfToExternalDString(encoding, string, length, &ds);

    if (Tcl_DStringLength(&ds) > 4) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "expected Macintosh OS type but got \"%s\": ", string));

	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "MAC_OSTYPE", NULL);
	}
	result = TCL_ERROR;
    } else {
	OSType osType;
	char bytes[4] = {'\0','\0','\0','\0'};

    int data;
    int stop;
} TtyAttrs;

#endif	/* !SUPPORTS_TTY */

#define UNSUPPORTED_OPTION(detail) \
    if (interp) {							\
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(				\
		"%s not supported for this platform", (detail)));	\
	Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);		\
    }

/*
 * Static routines for this file:
 */

static int		FileBlockModeProc(ClientData instanceData, int mode);

	    return TCL_ERROR;
#endif /* CRTSCTS */
	} else if (strncasecmp(value, "DTRDSR", vlen) == 0) {
	    UNSUPPORTED_OPTION("-handshake DTRDSR");
	    return TCL_ERROR;
	} else {
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"bad value for -handshake: must be one of"
			" xonxoff, rtscts, dtrdsr or none", -1));

		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
			"VALUE", NULL);
	    }
	    return TCL_ERROR;
	}
	SETIOSTATE(fsPtr->fd, &iostate);
	return TCL_OK;
    }

    /*
     * Option -xchar {\x11 \x13}
     */

    if ((len > 1) && (strncmp(optionName, "-xchar", len) == 0)) {
	Tcl_DString ds;

	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
	    return TCL_ERROR;
	} else if (argc != 2) {
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"bad value for -xchar: should be a list of"
			" two elements", -1));
		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
			"VALUE", NULL);
	    }
	    ckfree(argv);
	    return TCL_ERROR;
	}

	int i;

	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
	    return TCL_ERROR;
	}
	if ((argc % 2) == 1) {
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"bad value for -ttycontrol: should be a list of"
			" signal,value pairs", -1));
		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
			"VALUE", NULL);
	    }
	    ckfree(argv);
	    return TCL_ERROR;
	}

#else /* !SETBREAK */
		UNSUPPORTED_OPTION("-ttycontrol BREAK");
		ckfree(argv);
		return TCL_ERROR;
#endif /* SETBREAK */
	    } else {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "bad signal \"%s\" for -ttycontrol: must be"
			    " DTR, RTS or BREAK", argv[i]));
		    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
			"VALUE", NULL);
		}
		ckfree(argv);
		return TCL_ERROR;
	    }
	} /* -ttycontrol options loop */

    char parity;
    static const char *bad = "bad value for -mode";

    i = sscanf(mode, "%d,%c,%d,%d%n", speedPtr, &parity, dataPtr,
	    stopPtr, &end);
    if ((i != 4) || (mode[end] != '\0')) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "%s: should be baud,parity,data,stop", bad));

	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
	}
	return TCL_ERROR;
    }

    /*
     * Only allow setting mark/space parity on platforms that support it Make

#if defined(PAREXT) || defined(USE_TERMIO)
        strchr("noems", parity)
#else
        strchr("noe", parity)
#endif /* PAREXT|USE_TERMIO */
                               == NULL) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "%s parity: should be %s", bad,
#if defined(PAREXT) || defined(USE_TERMIO)
		    "n, o, e, m, or s"
#else
		    "n, o, or e"
#endif /* PAREXT|USE_TERMIO */
		    ));
	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
	}
	return TCL_ERROR;
    }
    *parityPtr = parity;
    if ((*dataPtr < 5) || (*dataPtr > 8)) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "%s data: should be 5, 6, 7, or 8", bad));

	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
	}
	return TCL_ERROR;
    }
    if ((*stopPtr < 0) || (*stopPtr > 2)) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "%s stop: should be 1 or 2", bad));
	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}


    SET_BITS(mode, O_BINARY);
#endif

    fd = TclOSopen(native, mode, permissions);

    if (fd < 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "couldn't open \"%s\": %s",
		    TclGetString(pathPtr), Tcl_PosixError(interp)));
	}
	return NULL;
    }

    /*
     * Set close-on-exec flag on the fd so that child processes will not
     * inherit this fd.

    ClientData data;
    FILE *f;

    chan = Tcl_GetChannel(interp, chanID, &chanMode);
    if (chan == NULL) {
	return TCL_ERROR;
    }
    if (forWriting && !(chanMode & TCL_WRITABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"\"%s\" wasn't opened for writing", chanID));

	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NOT_WRITABLE",
		NULL);
	return TCL_ERROR;
    } else if (!forWriting && !(chanMode & TCL_READABLE)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"\"%s\" wasn't opened for reading", chanID));

	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NOT_READABLE",
		NULL);
	return TCL_ERROR;
    }

    /*
     * We allow creating a FILE * out of file based, pipe based and socket

	     * The call to fdopen below is probably dangerous, since it will
	     * truncate an existing file if the file is being opened for
	     * writing....
	     */

	    f = fdopen(fd, (forWriting ? "w" : "r"));
	    if (f == NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"cannot get a FILE * for \"%s\"", chanID));

		Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL",
			"FILE_FAILURE", NULL);
		return TCL_ERROR;
	    }
	    *filePtr = f;
	    return TCL_OK;
	}
    }

    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "\"%s\" cannot be used to get a FILE *", chanID));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NO_DESCRIPTOR",
	    NULL);
    return TCL_ERROR;
}

#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */

    struct group *groupPtr;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }

    groupPtr = TclpGetGrGid(statBuf.st_gid);

    if (groupPtr == NULL) {

    struct passwd *pwPtr;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }

    pwPtr = TclpGetPwUid(statBuf.st_uid);

    if (pwPtr == NULL) {

    Tcl_StatBuf statBuf;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_ObjPrintf(
	    "%0#5lo", (long) (statBuf.st_mode & 0x00007FFF));
    return TCL_OK;

	native = Tcl_UtfToExternalDString(NULL, string, length, &ds);
	groupPtr = TclpGetGrNam(native); /* INTL: Native. */
	Tcl_DStringFree(&ds);

	if (groupPtr == NULL) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not set group for file \"%s\":"
			" group \"%s\" does not exist",
			TclGetString(fileName), string));

		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "SETGRP",
			"NO_GROUP", NULL);
	    }
	    return TCL_ERROR;
	}
	gid = groupPtr->gr_gid;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chown(native, (uid_t) -1, (gid_t) gid);	/* INTL: Native. */

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set group for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*

	native = Tcl_UtfToExternalDString(NULL, string, length, &ds);
	pwPtr = TclpGetPwNam(native);			/* INTL: Native. */
	Tcl_DStringFree(&ds);

	if (pwPtr == NULL) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not set owner for file \"%s\":"
			" user \"%s\" does not exist",
			TclGetString(fileName), string));

		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "SETOWN",
			"NO_USER", NULL);
	    }
	    return TCL_ERROR;
	}
	uid = pwPtr->pw_uid;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chown(native, (uid_t) uid, (gid_t) -1);	/* INTL: Native. */

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set owner for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*

	 * We get the current mode of the file, in order to allow for ug+-=rwx
	 * style chmod strings.
	 */

	result = TclpObjStat(fileName, &buf);
	if (result != 0) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not read \"%s\": %s",
			TclGetString(fileName), Tcl_PosixError(interp)));

	    }
	    return TCL_ERROR;
	}
	newMode = (mode_t) (buf.st_mode & 0x00007FFF);

	if (GetModeFromPermString(NULL, modeStringPtr, &newMode) != TCL_OK) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"unknown permission string format \"%s\"",
			modeStringPtr));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "PERMISSION", NULL);
	    }
	    return TCL_ERROR;
	}
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chmod(native, newMode);		/* INTL: Native. */
    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set permissions for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

#ifndef DJGPP

    Tcl_StatBuf statBuf;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_NewBooleanObj(statBuf.st_flags&UF_IMMUTABLE);

    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *

	return TCL_ERROR;
    }

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }

    if (readonly) {
	statBuf.st_flags |= UF_IMMUTABLE;
    } else {
	statBuf.st_flags &= ~UF_IMMUTABLE;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chflags(native, statBuf.st_flags);		/* INTL: Native. */
    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set flags for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));

	}
	return TCL_ERROR;
    }
    return TCL_OK;
}
#endif /* defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) */


	    return TCL_OK;
	}

	d = opendir(native);				/* INTL: Native. */
	if (d == NULL) {
	    Tcl_DStringFree(&ds);
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"couldn't read directory \"%s\": %s",
			Tcl_DStringValue(&dsOrig), Tcl_PosixError(interp)));

	    }
	    Tcl_DStringFree(&dsOrig);
	    Tcl_DecrRefCount(fileNamePtr);
	    return TCL_ERROR;
	}

	nativeDirLen = Tcl_DStringLength(&ds);

#ifdef USEGETWD
    if (getwd(buffer) == NULL)				/* INTL: Native. */
#else
    if (getcwd(buffer, MAXPATHLEN+1) == NULL)		/* INTL: Native. */
#endif
    {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error getting working directory name: %s",
		    Tcl_PosixError(interp)));
	}
	return NULL;
    }
    return Tcl_ExternalToUtfDString(NULL, buffer, -1, bufferPtr);
}

/*

    result = TclpNativeToNormalized(fileName);
    close(fd);
    return result;
}

/*
 *----------------------------------------------------------------------------
 *
 * TclpTempFileNameForLibrary --
 *
 *	Constructs a file name in the native file system where a dynamically
 *	loaded library may be placed.
 *
 * Results:
 *	Returns the constructed file name. If an error occurs, returns NULL
 *	and leaves an error message in the interpreter result.

 *
 * On Unix, it works to load a shared object from a file of any name, so this
 * function is merely a thin wrapper around TclpTempFileName().

 *	
 *----------------------------------------------------------------------------
 */

Tcl_Obj *
TclpTempFileNameForLibrary(
    Tcl_Interp *interp,		/* Tcl interpreter. */
    Tcl_Obj *path)		/* Path name of the library in the VFS. */

{

    Tcl_Obj *retval = TclpTempFileName();

    if (retval == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't create temporary file: %s",
		Tcl_PosixError(interp)));
    }
    return retval;
}

/*
 *----------------------------------------------------------------------
 *

    /*
     * Create a pipe that the child can use to return error information if
     * anything goes wrong.
     */

    if (TclpCreatePipe(&errPipeIn, &errPipeOut) == 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't create pipe: %s", Tcl_PosixError(interp)));
	goto error;
    }

    /*
     * We need to allocate and convert this before the fork so it is properly
     * deallocated later
     */

    dsArray = TclStackAlloc(interp, argc * sizeof(Tcl_DString));
    newArgv = TclStackAlloc(interp, (argc+1) * sizeof(char *));
    newArgv[argc] = NULL;
    for (i = 0; i < argc; i++) {
	newArgv[i] = Tcl_UtfToExternalDString(NULL, argv[i], -1, &dsArray[i]);
    }

#ifdef USE_VFORK
    /*
     * After vfork(), do not call code in the child that changes global state,
     * because it is using the parent's memory space at that point and writes
     * might corrupt the parent: so ensure standard channels are initialized
     * in the parent, otherwise SetupStdFile() might initialize them in the
     * child.
     */

    if (!inputFile) {
	Tcl_GetStdChannel(TCL_STDIN);
    }
    if (!outputFile) {
        Tcl_GetStdChannel(TCL_STDOUT);

	if (!SetupStdFile(inputFile, TCL_STDIN)
		|| !SetupStdFile(outputFile, TCL_STDOUT)
		|| (!joinThisError && !SetupStdFile(errorFile, TCL_STDERR))
		|| (joinThisError &&
			((dup2(1,2) == -1) || (fcntl(2, F_SETFD, 0) != 0)))) {
	    sprintf(errSpace,
		    "%dforked process couldn't set up input/output", errno);
	    len = strlen(errSpace);
	    if (len != (size_t) write(fd, errSpace, len)) {
		    Tcl_Panic("TclpCreateProcess: unable to write to errPipeOut");
	    }
	    _exit(1);
	}

	/*
	 * Close the input side of the error pipe.
	 */

	RestoreSignals();
	execvp(newArgv[0], newArgv);			/* INTL: Native. */
	sprintf(errSpace, "%dcouldn't execute \"%.150s\"", errno, argv[0]);
	len = strlen(errSpace);
	if (len != (size_t) write(fd, errSpace, len)) {
	    Tcl_Panic("TclpCreateProcess: unable to write to errPipeOut");
	}
	_exit(1);
    }

    /*
     * Free the mem we used for the fork
     */

    for (i = 0; i < argc; i++) {
	Tcl_DStringFree(&dsArray[i]);
    }
    TclStackFree(interp, newArgv);
    TclStackFree(interp, dsArray);

    if (pid == -1) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't fork child process: %s", Tcl_PosixError(interp)));
	goto error;
    }

    /*
     * Read back from the error pipe to see if the child started up OK. The
     * info in the pipe (if any) consists of a decimal errno value followed by
     * an error message.
     */

    TclpCloseFile(errPipeOut);
    errPipeOut = NULL;

    fd = GetFd(errPipeIn);
    count = read(fd, errSpace, (size_t) (sizeof(errSpace) - 1));
    if (count > 0) {
	char *end;

	errSpace[count] = 0;
	errno = strtol(errSpace, &end, 10);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("%s: %s",
		end, Tcl_PosixError(interp)));
	goto error;
    }

    TclpCloseFile(errPipeIn);
    *pidPtr = (Tcl_Pid) INT2PTR(pid);
    return TCL_OK;

    Tcl_Channel *rchan,		/* Returned read side. */
    Tcl_Channel *wchan,		/* Returned write side. */
    int flags)			/* Reserved for future use. */
{
    int fileNums[2];

    if (pipe(fileNums) < 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("pipe creation failed: %s",
		Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    fcntl(fileNums[0], F_SETFD, FD_CLOEXEC);
    fcntl(fileNums[1], F_SETFD, FD_CLOEXEC);

    *rchan = Tcl_MakeFileChannel(INT2PTR(fileNums[0]), TCL_READABLE);

 * once, and so can be used without regard to side effects.
 */

#define SET_BITS(var, bits)	((var) |= (bits))
#define CLEAR_BITS(var, bits)	((var) &= ~(bits))

/* "sock" + a pointer in hex + \0 */
#define SOCK_CHAN_LENGTH        (4 + sizeof(void *) * 2 + 1)
#define SOCK_TEMPLATE           "sock%lx"

#undef SOCKET   /* Possible conflict with win32 SOCKET */

/*
 * This is needed to comply with the strict aliasing rules of GCC, but it also
 * simplifies casting between the different sockaddr types.
 */

typedef union {

    Tcl_Channel channel;	/* Channel associated with this file. */
    TcpFdList fds;		/* The file descriptors of the sockets. */
    int flags;			/* ORed combination of the bitfields defined
				 * below. */
    /*
     * Only needed for server sockets
     */

    Tcl_TcpAcceptProc *acceptProc;
                                /* Proc to call on accept. */
    ClientData acceptProcData;  /* The data for the accept proc. */

    /*
     * Only needed for client sockets
     */

    struct addrinfo *addrlist;	/* Addresses to connect to. */
    struct addrinfo *addr;	/* Iterator over addrlist. */
    struct addrinfo *myaddrlist;/* Local address. */
    struct addrinfo *myaddr;	/* Iterator over myaddrlist. */
    int filehandlers;           /* Caches FileHandlers that get set up while
                                 * an async socket is not yet connected. */
    int status;                 /* Cache status of async socket. */
    int cachedBlocking;         /* Cache blocking mode of async socket. */
};

/*
 * These bits may be ORed together into the "flags" field of a TcpState
 * structure.
 */

#define TCP_ASYNC_SOCKET	(1<<0)	/* Asynchronous socket. */
#define TCP_ASYNC_CONNECT	(1<<1)	/* Async connect in progress. */

/*
 * The following defines the maximum length of the listen queue. This is the
 * number of outstanding yet-to-be-serviced requests for a connection on a
 * server socket, more than this number of outstanding requests and the
 * connection request will fail.
 */

#ifndef SOMAXCONN
#   define SOMAXCONN	100


#elif (SOMAXCONN < 100)
#   undef  SOMAXCONN
#   define SOMAXCONN	100
#endif /* SOMAXCONN < 100 */

/*
 * The following defines how much buffer space the kernel should maintain for
 * a socket.

        } else {
	    native = u.nodename;
        }
    }
    if (native == NULL) {
	native = tclEmptyStringRep;
    }
#else /* !NO_UNAME */
    /*
     * Uname doesn't exist; try gethostname instead.
     *
     * There is no portable macro for the maximum length of host names
     * returned by gethostbyname(). We should only trust SYS_NMLN if it is at
     * least 255 + 1 bytes to comply with DNS host name limits.
     *

#    else
    char buffer[256];
#    endif

    if (gethostname(buffer, sizeof(buffer)) > -1) {	/* INTL: Native. */
	native = buffer;
    }
#endif /* NO_UNAME */

    *encodingPtr = Tcl_GetEncoding(NULL, NULL);
    *lengthPtr = strlen(native);
    *valuePtr = ckalloc((*lengthPtr) + 1);
    memcpy(*valuePtr, native, (size_t)(*lengthPtr)+1);
}


static int
TcpBlockModeProc(
    ClientData instanceData,	/* Socket state. */
    int mode)			/* The mode to set. Can be one of
				 * TCL_MODE_BLOCKING or
				 * TCL_MODE_NONBLOCKING. */
{
    TcpState *statePtr = instanceData;

    if (mode == TCL_MODE_BLOCKING) {
	CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
    } else {
	SET_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
    }
    if (statePtr->flags & TCP_ASYNC_CONNECT) {

TcpInputProc(
    ClientData instanceData,	/* Socket state. */
    char *buf,			/* Where to store data read. */
    int bufSize,		/* How much space is available in the
				 * buffer? */
    int *errorCodePtr)		/* Where to store error code. */
{
    TcpState *statePtr = instanceData;
    int bytesRead;

    *errorCodePtr = 0;
    if (WaitForConnect(statePtr, errorCodePtr) != 0) {
	return -1;
    }
    bytesRead = recv(statePtr->fds.fd, buf, (size_t) bufSize, 0);

static int
TcpOutputProc(
    ClientData instanceData,	/* Socket state. */
    const char *buf,		/* The data buffer. */
    int toWrite,		/* How many bytes to write? */
    int *errorCodePtr)		/* Where to store error code. */
{
    TcpState *statePtr = instanceData;
    int written;

    *errorCodePtr = 0;
    if (WaitForConnect(statePtr, errorCodePtr) != 0) {
	return -1;
    }
    written = send(statePtr->fds.fd, buf, (size_t) toWrite, 0);

	/* ARGSUSED */
static int
TcpCloseProc(
    ClientData instanceData,	/* The socket to close. */
    Tcl_Interp *interp)		/* For error reporting - unused. */
{
    TcpState *statePtr = instanceData;
    int errorCode = 0;
    TcpFdList *fds;

    /*
     * Delete a file handler that may be active for this socket if this is a
     * server socket - the file handler was created automatically by Tcl as
     * part of the mechanism to accept new client connections. Channel

static int
TcpClose2Proc(
    ClientData instanceData,	/* The socket to close. */
    Tcl_Interp *interp,		/* For error reporting. */
    int flags)			/* Flags that indicate which side to close. */
{
    TcpState *statePtr = instanceData;
    int errorCode = 0;
    int sd;

    /*
     * Shutdown the OS socket handle.
     */

    switch(flags) {
    case TCL_CLOSE_READ:
        sd = SHUT_RD;
        break;
    case TCL_CLOSE_WRITE:
        sd = SHUT_WR;
        break;
    default:
        if (interp) {
            Tcl_SetObjResult(interp, Tcl_NewStringObj(
                    "socket close2proc called bidirectionally", -1));
        }
        return TCL_ERROR;
    }
    if (shutdown(statePtr->fds.fd,sd) < 0) {
	errorCode = errno;
    }

    Tcl_Interp *interp,		/* For error reporting - can be NULL. */
    const char *optionName,	/* Name of the option to retrieve the value
				 * for, or NULL to get all options and their
				 * values. */
    Tcl_DString *dsPtr)		/* Where to store the computed value;
				 * initialized by caller. */
{
    TcpState *statePtr = instanceData;
    char host[NI_MAXHOST], port[NI_MAXSERV];
    size_t len = 0;
    int reverseDNS = 0;
#define SUPPRESS_RDNS_VAR "::tcl::unsupported::noReverseDNS"

    if (optionName != NULL) {
	len = strlen(optionName);
    }

    if ((len > 1) && (optionName[1] == 'e') &&
	    (strncmp(optionName, "-error", len) == 0)) {
	socklen_t optlen = sizeof(int);
	int err, ret;

        if (statePtr->status == 0) {
            ret = getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
                    (char *) &err, &optlen);
            if (ret < 0) {
                err = errno;
            }
        } else {
            err = statePtr->status;
            statePtr->status = 0;
        }
	if (err != 0) {
	    Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(err), -1);
	}
	return TCL_OK;
    }

    if (interp != NULL && Tcl_GetVar(interp, SUPPRESS_RDNS_VAR, 0) != NULL) {
        reverseDNS = NI_NUMERICHOST;
    }
    

    if ((len == 0) || ((len > 1) && (optionName[1] == 'p') &&
	    (strncmp(optionName, "-peername", len) == 0))) {
        address peername;
        socklen_t size = sizeof(peername);

	if (getpeername(statePtr->fds.fd, &peername.sa, &size) >= 0) {
	    if (len == 0) {
		Tcl_DStringAppendElement(dsPtr, "-peername");
		Tcl_DStringStartSublist(dsPtr);

	     * (len==0), don't flag an error at that point because it could be
	     * an fconfigure request on a server socket (which have no peer).
	     * Same must be done on win&mac.
	     */

	    if (len) {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                            "can't get peername: %s",
			    Tcl_PosixError(interp)));
		}
		return TCL_ERROR;
	    }
	}
    }


    if ((len == 0) || ((len > 1) && (optionName[1] == 's') &&
	    (strncmp(optionName, "-sockname", len) == 0))) {
	TcpFdList *fds;
        address sockname;
        socklen_t size;
	int found = 0;

	if (len == 0) {

                        || (IN6_IS_ADDR_V4MAPPED(&sockname.sa6.sin6_addr) &&
                            sockname.sa6.sin6_addr.s6_addr[12] == 0 &&
                            sockname.sa6.sin6_addr.s6_addr[13] == 0 &&
                            sockname.sa6.sin6_addr.s6_addr[14] == 0 &&
                            sockname.sa6.sin6_addr.s6_addr[15] == 0)) {
                        flags |= NI_NUMERICHOST;
                    }
#endif /* NEED_FAKE_RFC2553 */
                }
		getnameinfo(&sockname.sa, size, host, sizeof(host), port,
                        sizeof(port), flags);
		Tcl_DStringAppendElement(dsPtr, host);
		Tcl_DStringAppendElement(dsPtr, port);
	    }
	}
        if (found) {
            if (len) {
                return TCL_OK;
            }
            Tcl_DStringEndSublist(dsPtr);
        } else {
            if (interp) {
                Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                        "can't get sockname: %s", Tcl_PosixError(interp)));
            }
	    return TCL_ERROR;
	}
    }

    if (len > 0) {
	return Tcl_BadChannelOption(interp, optionName, "peername sockname");

static void
TcpWatchProc(
    ClientData instanceData,	/* The socket state. */
    int mask)			/* Events of interest; an OR-ed combination of
				 * TCL_READABLE, TCL_WRITABLE and
				 * TCL_EXCEPTION. */
{
    TcpState *statePtr = instanceData;

    if (statePtr->acceptProc != NULL) {
        /*
         * Make sure we don't mess with server sockets since they will never
         * be readable or writable at the Tcl level. This keeps Tcl scripts
         * from interfering with the -accept behavior (bug #3394732).
         */
    	return;
    }
     
    if (statePtr->flags & TCP_ASYNC_CONNECT) {
        /* Async sockets use a FileHandler internally while connecting, so we
         * need to cache this request until the connection has succeeded. */
        statePtr->filehandlers = mask;
    } else if (mask) {
        Tcl_CreateFileHandler(statePtr->fds.fd, mask,
                (Tcl_FileProc *) Tcl_NotifyChannel, statePtr->channel);

    } else {
        Tcl_DeleteFileHandler(statePtr->fds.fd);
    }
}

/*
 *----------------------------------------------------------------------

	/* ARGSUSED */
static int
TcpGetHandleProc(
    ClientData instanceData,	/* The socket state. */
    int direction,		/* Not used. */
    ClientData *handlePtr)	/* Where to store the handle. */
{
    TcpState *statePtr = instanceData;

    *handlePtr = INT2PTR(statePtr->fds.fd);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------

    int async = state->flags & TCP_ASYNC_CONNECT;

    if (async_callback) {
        goto reenter;
    }

    for (state->addr = state->addrlist; state->addr != NULL;
            state->addr = state->addr->ai_next) {

	status = -1;

        for (state->myaddr = state->myaddrlist; state->myaddr != NULL;
                state->myaddr = state->myaddr->ai_next) {
            int reuseaddr;
            
	    /*
	     * No need to try combinations of local and remote addresses of
	     * different families.
	     */

	    if (state->myaddr->ai_family != state->addr->ai_family) {
		continue;
	    }

            /*
             * Close the socket if it is still open from the last unsuccessful
             * iteration.
             */

            if (state->fds.fd >= 0) {
		close(state->fds.fd);
		state->fds.fd = -1;
	    }

	    state->fds.fd = socket(state->addr->ai_family, SOCK_STREAM, 0);
	    if (state->fds.fd < 0) {

	    /*
	     * Set kernel space buffering
	     */
	    
	    TclSockMinimumBuffers(INT2PTR(state->fds.fd), SOCKET_BUFSIZE);
    
	    if (async) {
		status = TclUnixSetBlockingMode(state->fds.fd,
                        TCL_MODE_NONBLOCKING);
		if (status < 0) {
                    continue;
		}
	    }

            reuseaddr = 1;
            (void) setsockopt(state->fds.fd, SOL_SOCKET, SO_REUSEADDR,
                    (char *) &reuseaddr, sizeof(reuseaddr));
            status = bind(state->fds.fd, state->myaddr->ai_addr,
                    state->myaddr->ai_addrlen);
            if (status < 0) {
                continue;
            }

	    /*
	     * Attempt to connect. The connect may fail at present with an
	     * EINPROGRESS but at a later time it will complete. The caller
	     * will set up a file handler on the socket if she is interested
	     * in being informed when the connect completes.
	     */
	    
	    status = connect(state->fds.fd, state->addr->ai_addr,
                    state->addr->ai_addrlen);
	    if (status < 0 && errno == EINPROGRESS) {
                Tcl_CreateFileHandler(state->fds.fd,

                        TCL_WRITABLE|TCL_EXCEPTION, TcpAsyncCallback, state);
                return TCL_OK;

            reenter:
                Tcl_DeleteFileHandler(state->fds.fd);

                /*
                 * Read the error state from the socket to see if the async
                 * connection has succeeded or failed. As this clears the
                 * error condition, we cache the status in the socket state
                 * struct for later retrieval by [fconfigure -error].
                 */

                optlen = sizeof(int);
                getsockopt(state->fds.fd, SOL_SOCKET, SO_ERROR,
                        (char *) &status, &optlen);
                state->status = status;
            }
	    if (status == 0) {
		CLEAR_BITS(state->flags, TCP_ASYNC_CONNECT);
		goto out;
	    }
	}
    }

out:

    if (async_callback) {
        /*
         * An asynchonous connection has finally succeeded or failed.
         */

        TcpWatchProc(state, state->filehandlers);
        TclUnixSetBlockingMode(state->fds.fd, state->cachedBlocking);

        /*
         * We need to forward the writable event that brought us here, bcasue
         * upon reading of getsockopt(SO_ERROR), at least some OSes clear the
         * writable state from the socket, and so a subsequent select() on
         * behalf of a script level [fileevent] would not fire. It doesn't
         * hurt that this is also called in the successful case and will save
         * the event mechanism one roundtrip through select().
         */


        Tcl_NotifyChannel(state->channel, TCL_WRITABLE);
    } else if (status != 0) {
        /*
         * Failure for either a synchronous connection, or an async one that
         * failed before it could enter background mode, e.g. because an
         * invalid -myaddr was given.
         */

        if (interp != NULL) {
            Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                    "couldn't open socket: %s", Tcl_PosixError(interp)));
        }
        return TCL_ERROR;
    }
    return TCL_OK;
}

/*

    const char *errorMsg = NULL;
    struct addrinfo *addrlist = NULL, *myaddrlist = NULL;
    char channelName[SOCK_CHAN_LENGTH];

    /*
     * Do the name lookups for the local and remote addresses.
     */

    if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg)
            || !TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1,
                    &errorMsg)) {
        if (addrlist != NULL) {
            freeaddrinfo(addrlist);
        }
        if (interp != NULL) {
            Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                    "couldn't open socket: %s", errorMsg));
        }
        return NULL;
    }

    /*
     * Allocate a new TcpState for this socket.
     */

     * Create a new client socket and wrap it in a channel.
     */
    if (CreateClientSocket(interp, state) != TCL_OK) {
        TcpCloseProc(state, NULL);
        return NULL;
    }

    sprintf(channelName, SOCK_TEMPLATE, (long) state);

    state->channel = Tcl_CreateChannel(&tcpChannelType, channelName, state,
            (TCL_READABLE | TCL_WRITABLE));
    if (Tcl_SetChannelOption(interp, state->channel, "-translation",
	    "auto crlf") == TCL_ERROR) {
	Tcl_Close(NULL, state->channel);
	return NULL;
    }
    return state->channel;
}

    const char *errorMsg = NULL;
    TcpFdList *fds = NULL, *newfds;

    /*
     * Try to record and return the most meaningful error message, i.e. the
     * one from the first socket that went the farthest before it failed.
     */

    enum { LOOKUP, SOCKET, BIND, LISTEN } howfar = LOOKUP;
    int my_errno = 0;

    if (!TclCreateSocketAddress(interp, &addrlist, myHost, port, 1, &errorMsg)) {
	my_errno = errno;
	goto error;
    }

    for (addrPtr = addrlist; addrPtr != NULL; addrPtr = addrPtr->ai_next) {
	sock = socket(addrPtr->ai_family, addrPtr->ai_socktype,
                addrPtr->ai_protocol);
	if (sock == -1) {
	    if (howfar < SOCKET) {
		howfar = SOCKET;
		my_errno = errno;
	    }
	    continue;
	}

	/* Missing on: Solaris 2.8 */
        if (addrPtr->ai_family == AF_INET6) {
            int v6only = 1;

            (void) setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
                    &v6only, sizeof(v6only));
        }
#endif /* IPV6_V6ONLY */

	status = bind(sock, addrPtr->ai_addr, addrPtr->ai_addrlen);
        if (status == -1) {
	    if (howfar < BIND) {
		howfar = BIND;
		my_errno = errno;
	    }       

             * Allocate a new TcpState for this socket.
             */
            
            statePtr = ckalloc(sizeof(TcpState));
            memset(statePtr, 0, sizeof(TcpState));
            statePtr->acceptProc = acceptProc;
            statePtr->acceptProcData = acceptProcData;
            sprintf(channelName, SOCK_TEMPLATE, (long) statePtr);
            newfds = &statePtr->fds;
        } else {
            newfds = ckalloc(sizeof(TcpFdList));
            memset(newfds, (int) 0, sizeof(TcpFdList));
            fds->next = newfds;
        }
        newfds->fd = sock;

    }
    if (statePtr != NULL) {
	statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
		statePtr, 0);
	return statePtr->channel;
    }
    if (interp != NULL) {
        Tcl_Obj *errorObj = Tcl_NewStringObj("couldn't open socket: ", -1);

	if (errorMsg == NULL) {
            errno = my_errno;
            Tcl_AppendToObj(errorObj, Tcl_PosixError(interp), -1);
        } else {
	    Tcl_AppendToObj(errorObj, errorMsg, -1);
	}
        Tcl_SetObjResult(interp, errorObj);
    }
    if (sock != -1) {
	close(sock);
    }
    return NULL;
}


    TcpState *newSockState;	/* State for new socket. */
    address addr;		/* The remote address */
    socklen_t len;		/* For accept interface */
    char channelName[SOCK_CHAN_LENGTH];
    char host[NI_MAXHOST], port[NI_MAXSERV];
    
    len = sizeof(addr);
    newsock = accept(fds->fd, &addr.sa, &len);
    if (newsock < 0) {
	return;
    }

    /*
     * Set close-on-exec flag to prevent the newly accepted socket from being
     * inherited by child processes.
     */

    (void) fcntl(newsock, F_SETFD, FD_CLOEXEC);

    newSockState = ckalloc(sizeof(TcpState));
    memset(newSockState, 0, sizeof(TcpState));
    newSockState->flags = 0;
    newSockState->fds.fd = newsock;

    sprintf(channelName, SOCK_TEMPLATE, (long) newSockState);
    newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
	    newSockState, (TCL_READABLE | TCL_WRITABLE));

    Tcl_SetChannelOption(NULL, newSockState->channel, "-translation",
	    "auto crlf");

    if (fds->statePtr->acceptProc != NULL) {
	getnameinfo(&addr.sa, len, host, sizeof(host), port, sizeof(port),
                NI_NUMERICHOST|NI_NUMERICSERV);
	fds->statePtr->acceptProc(fds->statePtr->acceptProcData,
                newSockState->channel, host, atoi(port));
    }
}

/*

	DWORD err = GetLastError();

	if ((err & 0xffffL) == ERROR_OPEN_FAILED) {
	    err = (mode & O_CREAT) ? ERROR_FILE_EXISTS : ERROR_FILE_NOT_FOUND;
	}
	TclWinConvertError(err);
	if (interp != (Tcl_Interp *) NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "couldn't open \"%s\": %s",
		    TclGetString(pathPtr),, Tcl_PosixError(interp)));
	}
	return NULL;
    }

    channel = NULL;

    switch (FileGetType(handle)) {
    case FILE_TYPE_SERIAL:
	/*
	 * Reopen channel for OVERLAPPED operation. Normally this shouldn't
	 * fail, because the channel exists.
	 */

	handle = TclWinSerialReopen(handle, nativeName, accessMode);
	if (handle == INVALID_HANDLE_VALUE) {
	    TclWinConvertError(GetLastError());
	    if (interp != (Tcl_Interp *) NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"couldn't reopen serial \"%s\": %s",
			TclGetString(pathPtr), Tcl_PosixError(interp)));

	    }
	    return NULL;
	}
	channel = TclWinOpenSerialChannel(handle, channelName,
		channelPermissions);
	break;
    case FILE_TYPE_CONSOLE:

    default:
	/*
	 * The handle is of an unknown type, probably /dev/nul equivalent or
	 * possibly a closed handle.
	 */

	channel = NULL;
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't open \"%s\": bad file type",
		TclGetString(pathPtr)));
	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "BAD_TYPE",
		NULL);
	break;
    }

    return channel;
}

{
    if (!Tcl_InitStubs(interp, "8.1", 0)) {
	return TCL_ERROR;
    }

#ifdef UNICODE
    if (TclWinGetPlatformId() < VER_PLATFORM_WIN32_NT) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"Win32s and Windows 9x are not supported platforms", -1));
	return TCL_ERROR;
    }
#endif
    Tcl_CreateObjCommand(interp, "dde", DdeObjCmd, NULL, NULL);
    Tcl_CreateExitHandler(DdeExitProc, NULL);
    return Tcl_PkgProvide(interp, TCL_DDE_PACKAGE_NAME, TCL_DDE_VERSION);
}

    ddeConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);
    DdeFreeStringHandle(ddeInstance, ddeService);
    DdeFreeStringHandle(ddeInstance, ddeTopic);

    if (ddeConv == (HCONV) NULL) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "no registered server named \"%s\"", name));

	    Tcl_SetErrorCode(interp, "TCL", "DDE", "NO_SERVER", NULL);
	}
	return TCL_ERROR;
    }

    *ddeConvPtr = ddeConv;
    return TCL_OK;

static void
StatError(
    Tcl_Interp *interp,		/* The interp that has the error */
    Tcl_Obj *fileName)		/* The name of the file which caused the
				 * error. */
{
    TclWinConvertError(GetLastError());
    Tcl_SetObjResult(interp, Tcl_ObjPrintf("could not read \"%s\": %s",
	    TclGetString(fileName), Tcl_PosixError(interp)));
}

/*
 *----------------------------------------------------------------------
 *
 * GetWinFileAttributes --
 *

    int pathc, i;
    Tcl_Obj *splitPath;

    splitPath = Tcl_FSSplitPath(fileName, &pathc);

    if (splitPath == NULL || pathc == 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": no such file or directory",
		    Tcl_GetString(fileName)));

	    errno = ENOENT;
	    Tcl_PosixError(interp);
	}
	goto cleanup;
    }

    /*

static int
CannotSetAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file. */
    Tcl_Obj *attributePtr)	/* The new value of the attribute. */
{
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "cannot set attribute \"%s\" for file \"%s\": attribute is readonly",
	    tclpFileAttrStrings[objIndex], Tcl_GetString(fileName)));

    errno = EINVAL;
    Tcl_PosixError(interp);
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------

		Tcl_DStringFree(&dsOrig);
		return TCL_OK;
	    }

	    TclWinConvertError(err);
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"couldn't read directory \"%s\": %s",
			Tcl_DStringValue(&dsOrig), Tcl_PosixError(interp)));

	    }
	    Tcl_DStringFree(&dsOrig);
	    return TCL_ERROR;
	}
	Tcl_DStringFree(&ds);

	/*

    TCHAR buffer[MAX_PATH];
    char *p;
    WCHAR *native;

    if (GetCurrentDirectory(MAX_PATH, buffer) == 0) {
	TclWinConvertError(GetLastError());
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error getting working directory name: %s",
		    Tcl_PosixError(interp)));
	}
	return NULL;
    }

    /*
     * Watch for the weird Windows c:\\UNC syntax.
     */

	}
    } else {
	DuplicateHandle(hProcess, inputHandle, hProcess, &startInfo.hStdInput,
		0, TRUE, DUPLICATE_SAME_ACCESS);
    }
    if (startInfo.hStdInput == INVALID_HANDLE_VALUE) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't duplicate input handle: %s",
		Tcl_PosixError(interp)));
	goto end;
    }

    if (outputHandle == INVALID_HANDLE_VALUE) {
	/*
	 * If handle was not set, output should be sent to an infinitely deep
	 * sink. Under Windows 95, some 16 bit applications cannot have stdout

	}
    } else {
	DuplicateHandle(hProcess, outputHandle, hProcess,
		&startInfo.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
    }
    if (startInfo.hStdOutput == INVALID_HANDLE_VALUE) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't duplicate output handle: %s",
		Tcl_PosixError(interp)));
	goto end;
    }

    if (errorHandle == INVALID_HANDLE_VALUE) {
	/*
	 * If handle was not set, errors should be sent to an infinitely deep
	 * sink.
	 */

	startInfo.hStdError = CreateFileA("NUL:", GENERIC_WRITE, 0,
		&secAtts, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    } else {
	DuplicateHandle(hProcess, errorHandle, hProcess, &startInfo.hStdError,
		0, TRUE, DUPLICATE_SAME_ACCESS);
    }
    if (startInfo.hStdError == INVALID_HANDLE_VALUE) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't duplicate error handle: %s",
		Tcl_PosixError(interp)));
	goto end;
    }

    /*
     * If we do not have a console window, then we must run DOS and WIN32
     * console mode applications as detached processes. This tells the loader
     * that the child application should not inherit the console, and that it

	if (HasConsole()) {
	    createFlags = 0;
	} else {
	    createFlags = DETACHED_PROCESS;
	}

	if (applType == APPL_DOS) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "DOS application process not supported on this platform",
		    -1));
	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "EXEC", "DOS_APP",
		    NULL);
	    goto end;
	}
    }

    /*

     * Additionally, when calling a 16-bit dos or windows application, all
     * path names must use the short, cryptic, path format (e.g., using
     * ab~1.def instead of "a b.default").
     */

    BuildCommandLine(execPath, argc, argv, &cmdLine);

    if (CreateProcess(NULL, (TCHAR *) Tcl_DStringValue(&cmdLine),
	    NULL, NULL, TRUE, (DWORD) createFlags, NULL, NULL, &startInfo,
	    &procInfo) == 0) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("couldn't execute \"%s\": %s",
		argv[0], Tcl_PosixError(interp)));
	goto end;
    }

    /*
     * This wait is used to force the OS to give some time to the DOS process.
     */

	}
	break;
    }
    Tcl_DStringFree(&nameBuf);

    if (applType == APPL_NONE) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("couldn't execute \"%s\": %s",
		originalName, Tcl_PosixError(interp)));
	return APPL_NONE;
    }

    if ((applType == APPL_DOS) || (applType == APPL_WIN3X)) {
	/*
	 * Replace long path name of executable with short path name for
	 * 16-bit applications. Otherwise the application may not be able to

    sec.nLength = sizeof(SECURITY_ATTRIBUTES);
    sec.lpSecurityDescriptor = NULL;
    sec.bInheritHandle = FALSE;

    if (!CreatePipe(&readHandle, &writeHandle, &sec, 0)) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"pipe creation failed: %s", Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    *rchan = Tcl_MakeFileChannel((ClientData) readHandle, TCL_READABLE);
    Tcl_RegisterChannel(interp, *rchan);

    *wchan = Tcl_MakeFileChannel((ClientData) writeHandle, TCL_WRITABLE);

int
Registry_Init(
    Tcl_Interp *interp)
{
    Tcl_Command cmd;

    if (Tcl_InitStubs(interp, "8.5", 0) == NULL) {
	return TCL_ERROR;
    }

    cmd = Tcl_CreateObjCommand(interp, "registry", RegistryObjCmd,
	    interp, DeleteCmd);
    Tcl_SetAssocData(interp, REGISTRY_ASSOC_KEY, NULL, cmd);
    return Tcl_PkgProvide(interp, "registry", "1.3.0");

    }

    valueName = Tcl_GetStringFromObj(valueNameObj, &length);
    Tcl_WinUtfToTChar(valueName, length, &ds);
    result = RegDeleteValue(key, (const TCHAR *)Tcl_DStringValue(&ds));
    Tcl_DStringFree(&ds);
    if (result != ERROR_SUCCESS) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"unable to delete value \"%s\" from key \"%s\": ",
		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));

	AppendSystemError(interp, result);
	result = TCL_ERROR;
    } else {
	result = TCL_OK;
    }
    RegCloseKey(key);
    return result;

    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to enumerate. */
    Tcl_Obj *patternObj,	/* Optional match pattern. */
    REGSAM mode)		/* Mode flags to pass. */
{
    const char *pattern;	/* Pattern being matched against subkeys */
    HKEY key;			/* Handle to the key being examined */
    TCHAR buffer[MAX_KEY_LENGTH];
				/* Buffer to hold the subkey name */
    DWORD bufSize;		/* Size of the buffer */
    DWORD index;		/* Position of the current subkey */
    char *name;			/* Subkey name */
    Tcl_Obj *resultPtr;		/* List of subkeys being accumulated */
    int result = TCL_OK;	/* Return value from this command */
    Tcl_DString ds;		/* Buffer to translate subkey name to UTF-8 */

	bufSize = MAX_KEY_LENGTH;
	result = RegEnumKeyEx(key, index, buffer, &bufSize,
		NULL, NULL, NULL, NULL);
	if (result != ERROR_SUCCESS) {
	    if (result == ERROR_NO_MORE_ITEMS) {
		result = TCL_OK;
	    } else {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"unable to enumerate subkeys of \"%s\": ",
			Tcl_GetString(keyNameObj)));
		AppendSystemError(interp, result);
		result = TCL_ERROR;
	    }
	    break;
	}
	Tcl_WinTCharToUtf(buffer, bufSize * sizeof(TCHAR), &ds);
	name = Tcl_DStringValue(&ds);

    nativeValue = Tcl_WinUtfToTChar(valueName, length, &ds);
    result = RegQueryValueEx(key, nativeValue, NULL, &type,
	    NULL, NULL);
    Tcl_DStringFree(&ds);
    RegCloseKey(key);

    if (result != ERROR_SUCCESS) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"unable to get type of value \"%s\" from key \"%s\": ",
		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));

	AppendSystemError(interp, result);
	return TCL_ERROR;
    }

    /*
     * Set the type into the result. Watch out for unknown types. If we don't
     * know about the type, just use the numeric value.

	Tcl_DStringSetLength(&data, (int) length * sizeof(TCHAR));
	result = RegQueryValueEx(key, nativeValue,
		NULL, &type, (BYTE *) Tcl_DStringValue(&data), &length);
    }
    Tcl_DStringFree(&buf);
    RegCloseKey(key);
    if (result != ERROR_SUCCESS) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"unable to get value \"%s\" from key \"%s\": ",
		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));

	AppendSystemError(interp, result);
	Tcl_DStringFree(&data);
	return TCL_ERROR;
    }

    /*
     * If the data is a 32-bit quantity, store it as an integer object. If it

		}
	    }
	}
    } else {
	rootName = name;
    }
    if (!rootName) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"bad key \"%s\": must start with a valid root", name));
	Tcl_SetErrorCode(interp, "WIN_REG", "NO_ROOT_KEY", NULL);
	return TCL_ERROR;
    }

    /*
     * Split the root into root and subkey portions.
     */

    /*
     * Option -mode baud,parity,databits,stopbits
     */

    if ((len > 2) && (strncmp(optionName, "-mode", len) == 0)) {
	if (!GetCommState(infoPtr->handle, &dcb)) {


	    goto getStateFailed;



	}
	native = Tcl_WinUtfToTChar(value, -1, &ds);
	result = BuildCommDCB(native, &dcb);
	Tcl_DStringFree(&ds);

	if (result == FALSE) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"bad value \"%s\" for -mode: should be baud,parity,data,stop",
			value));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
	    }
	    return TCL_ERROR;
	}

	/*
	 * Default settings for serial communications.
	 */

	dcb.fBinary = TRUE;
	dcb.fErrorChar = FALSE;
	dcb.fNull = FALSE;
	dcb.fAbortOnError = FALSE;

	if (!SetCommState(infoPtr->handle, &dcb)) {


	    goto setStateFailed;



	}
	return TCL_OK;
    }

    /*
     * Option -handshake none|xonxoff|rtscts|dtrdsr
     */

    if ((len > 1) && (strncmp(optionName, "-handshake", len) == 0)) {
	if (!GetCommState(infoPtr->handle, &dcb)) {


	    goto getStateFailed;



	}

	/*
	 * Reset all handshake options. DTR and RTS are ON by default.
	 */

	dcb.fOutX = dcb.fInX = FALSE;

	    dcb.fOutxCtsFlow = TRUE;
	    dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
	} else if (strncasecmp(value, "DTRDSR", vlen) == 0) {
	    dcb.fOutxDsrFlow = TRUE;
	    dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
	} else {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"bad value \"%s\" for -handshake: must be one of"
			" xonxoff, rtscts, dtrdsr or none", value));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "HANDSHAKE", NULL);
	    }
	    return TCL_ERROR;
	}

	if (!SetCommState(infoPtr->handle, &dcb)) {


	    goto setStateFailed;



	}
	return TCL_OK;
    }

    /*
     * Option -xchar {\x11 \x13}
     */

    if ((len > 1) && (strncmp(optionName, "-xchar", len) == 0)) {
	if (!GetCommState(infoPtr->handle, &dcb)) {


	    goto getStateFailed;



	}

	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
	    return TCL_ERROR;
	}
	if (argc != 2) {
	badXchar:
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"bad value for -xchar: should be a list of"
			" two elements with each a single character", -1));

		Tcl_SetErrorCode(interp, "TCL", "VALUE", "XCHAR", NULL);
	    }
	    ckfree(argv);
	    return TCL_ERROR;
	}

	/*

		goto badXchar;
	    }
	    dcb.XoffChar = (char) character;
	}
	ckfree(argv);

	if (!SetCommState(infoPtr->handle, &dcb)) {


	    goto setStateFailed;



	}
	return TCL_OK;
    }

    /*
     * Option -ttycontrol {DTR 1 RTS 0 BREAK 0}
     */

    if ((len > 4) && (strncmp(optionName, "-ttycontrol", len) == 0)) {
	int i, result = TCL_OK;

	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
	    return TCL_ERROR;
	}
	if ((argc % 2) == 1) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"bad value \"%s\" for -ttycontrol: should be "
			"a list of signal,value pairs", value));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "TTYCONTROL", NULL);
	    }
	    ckfree(argv);
	    return TCL_ERROR;
	}

	for (i = 0; i < argc - 1; i += 2) {
	    if (Tcl_GetBoolean(interp, argv[i+1], &flag) == TCL_ERROR) {
		result = TCL_ERROR;
		break;
	    }
	    if (strncasecmp(argv[i], "DTR", strlen(argv[i])) == 0) {
		if (!EscapeCommFunction(infoPtr->handle,
			(DWORD) (flag ? SETDTR : CLRDTR))) {
		    if (interp != NULL) {
			Tcl_SetObjResult(interp, Tcl_NewStringObj(
				"can't set DTR signal", -1));
			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
				"FCONFIGURE", "TTY_SIGNAL", NULL);
		    }
		    result = TCL_ERROR;
		    break;
		}
	    } else if (strncasecmp(argv[i], "RTS", strlen(argv[i])) == 0) {
		if (!EscapeCommFunction(infoPtr->handle,
			(DWORD) (flag ? SETRTS : CLRRTS))) {
		    if (interp != NULL) {
			Tcl_SetObjResult(interp, Tcl_NewStringObj(
				"can't set RTS signal", -1));
			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
				"FCONFIGURE", "TTY_SIGNAL", NULL);
		    }
		    result = TCL_ERROR;
		    break;
		}
	    } else if (strncasecmp(argv[i], "BREAK", strlen(argv[i])) == 0) {
		if (!EscapeCommFunction(infoPtr->handle,
			(DWORD) (flag ? SETBREAK : CLRBREAK))) {
		    if (interp != NULL) {
			Tcl_SetObjResult(interp, Tcl_NewStringObj(
				"can't set BREAK signal", -1));
			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
				"FCONFIGURE", "TTY_SIGNAL", NULL);
		    }
		    result = TCL_ERROR;
		    break;
		}
	    } else {
		if (interp != NULL) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "bad signal name \"%s\" for -ttycontrol: must be"
			    " DTR, RTS or BREAK", argv[i]));
		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "TTY_SIGNAL",
			    NULL);
		}
		result = TCL_ERROR;
		break;
	    }
	}

	    inSize  = atoi(argv[0]);
	    outSize = atoi(argv[1]);
	}
	ckfree(argv);

	if ((argc < 1) || (argc > 2) || (inSize <= 0) || (outSize <= 0)) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"bad value \"%s\" for -sysbuffer: should be "
			"a list of one or two integers > 0", value));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "SYS_BUFFER", NULL);
	    }
	    return TCL_ERROR;
	}

	if (!SetupComm(infoPtr->handle, inSize, outSize)) {
	    if (interp != NULL) {
		TclWinConvertError(GetLastError());
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"can't setup comm buffers: %s",
			Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
	infoPtr->sysBufRead  = inSize;
	infoPtr->sysBufWrite = outSize;

	/*
	 * Adjust the handshake limits. Yes, the XonXoff limits seem to
	 * influence even hardware handshake.
	 */

	if (!GetCommState(infoPtr->handle, &dcb)) {


	    goto getStateFailed;



	}
	dcb.XonLim = (WORD) (infoPtr->sysBufRead*1/2);
	dcb.XoffLim = (WORD) (infoPtr->sysBufRead*1/4);
	if (!SetCommState(infoPtr->handle, &dcb)) {


	    goto setStateFailed;



	}
	return TCL_OK;
    }

    /*
     * Option -pollinterval msec
     */

	if (Tcl_GetInt(interp, value, &msec) != TCL_OK) {
	    return TCL_ERROR;
	}
	tout.ReadTotalTimeoutConstant = msec;
	if (!SetCommTimeouts(infoPtr->handle, &tout)) {
	    if (interp != NULL) {
		TclWinConvertError(GetLastError());
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"can't set comm timeouts: %s",
			Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}

	return TCL_OK;
    }

    return Tcl_BadChannelOption(interp, optionName,
	    "mode handshake pollinterval sysbuffer timeout ttycontrol xchar");

  getStateFailed:
    if (interp != NULL) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"can't get comm state: ", Tcl_PosixError(interp)));
    }
    return TCL_ERROR;

  setStateFailed:
    if (interp != NULL) {
	TclWinConvertError(GetLastError());
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"can't set comm state: ", Tcl_PosixError(interp)));
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * SerialGetOptionProc --
 *

	char parity;
	const char *stop;
	char buf[2 * TCL_INTEGER_SPACE + 16];

	if (!GetCommState(infoPtr->handle, &dcb)) {
	    if (interp != NULL) {
		TclWinConvertError(GetLastError());
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"can't get comm state: %s", Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}

	valid = 1;
	parity = 'n';
	if (dcb.Parity <= 4) {

    if (len==0 || (len>1 && strncmp(optionName, "-xchar", len) == 0)) {
	char buf[4];
	valid = 1;

	if (!GetCommState(infoPtr->handle, &dcb)) {
	    if (interp != NULL) {
		TclWinConvertError(GetLastError());
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"can't get comm state: %s", Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
	sprintf(buf, "%c", dcb.XonChar);
	Tcl_DStringAppendElement(dsPtr, buf);
	sprintf(buf, "%c", dcb.XoffChar);
	Tcl_DStringAppendElement(dsPtr, buf);

    if (len>4 && strncmp(optionName, "-ttystatus", len)==0) {
	DWORD status;

	if (!GetCommModemStatus(infoPtr->handle, &status)) {
	    if (interp != NULL) {
		TclWinConvertError(GetLastError());
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"can't get tty status: %s", Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
	valid = 1;
	SerialModemStatusStr(status, dsPtr);
    }

    if (valid) {
	return TCL_OK;

    }
    return Tcl_BadChannelOption(interp, optionName,
	    "mode pollinterval lasterror queue sysbuffer ttystatus xchar");

}

/*
 *----------------------------------------------------------------------
 *
 * SerialThreadActionProc --
 *

    InitSockets();
    Tcl_MutexUnlock(&socketMutex);

    if (SocketsEnabled()) {
	return TCL_OK;
    }
    if (interp != NULL) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"sockets are not available on this system", -1));

    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *

	sd = SD_RECEIVE;
	break;
    case TCL_CLOSE_WRITE:
	sd = SD_SEND;
	break;
    default:
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "Socket close2proc called bidirectionally", -1));
	}
	return TCL_ERROR;
    }

    if (shutdown(infoPtr->sockets->fd, sd) == SOCKET_ERROR) {
	TclWinConvertError((DWORD) WSAGetLastError());
	errorCode = Tcl_GetErrno();

	SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT,
		(LPARAM) infoPtr);

	return infoPtr;
    }

    if (interp != NULL) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't open socket: %s",

		(errorMsg ? errorMsg : Tcl_PosixError(interp)));



    }

    if (sock != INVALID_SOCKET) {
	closesocket(sock);
    }
    return NULL;
}

     * Check that WinSock is initialized; do not call it if not, to prevent
     * system crashes. This can happen at exit time if the exit handler for
     * WinSock ran before other exit handlers that want to use sockets.
     */

    if (!SocketsEnabled()) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "winsock is not initialized", -1));
	}
	return TCL_ERROR;
    }

#ifdef TCL_FEATURE_KEEPALIVE_NAGLE
    sock = infoPtr->sockets->fd;

	    val = TRUE;
	}
	rtn = setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
		(const char *) &val, sizeof(BOOL));
	if (rtn != 0) {
	    TclWinConvertError(WSAGetLastError());
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"couldn't set socket option: %s",
			Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
	return TCL_OK;
    } else if (!strcasecmp(optionName, "-nagle")) {
	BOOL val = FALSE;
	int boolVar, rtn;

	if (Tcl_GetBoolean(interp, value, &boolVar) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (!boolVar) {
	    val = TRUE;
	}
	rtn = setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
		(const char *) &val, sizeof(BOOL));
	if (rtn != 0) {
	    TclWinConvertError(WSAGetLastError());
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"couldn't set socket option: %s",
			Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
	return TCL_OK;
    }

    return Tcl_BadChannelOption(interp, optionName, "keepalive nagle");

     * Check that WinSock is initialized; do not call it if not, to prevent
     * system crashes. This can happen at exit time if the exit handler for
     * WinSock ran before other exit handlers that want to use sockets.
     */

    if (!SocketsEnabled()) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "winsock is not initialized", -1));
	}
	return TCL_ERROR;
    }

    sock = infoPtr->sockets->fd;
    if (optionName != NULL) {
	len = strlen(optionName);

	     * an fconfigure request on a server socket (such sockets have no
	     * peer). {Copied from unix/tclUnixChan.c}
	     */

	    if (len) {
		TclWinConvertError((DWORD) WSAGetLastError());
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "can't get peername: %s",
			    Tcl_PosixError(interp)));
		}
		return TCL_ERROR;
	    }
	}
    }

    if ((len == 0) || ((len > 1) && (optionName[1] == 's') &&

		Tcl_DStringEndSublist(dsPtr);
	    } else {
		return TCL_OK;
	    }
	} else {
	    if (interp) {
		TclWinConvertError((DWORD) WSAGetLastError());
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"can't get sockname: %s", Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
    }

#ifdef TCL_FEATURE_KEEPALIVE_NAGLE
    if (len == 0 || !strncmp(optionName, "-keepalive", len)) {